Another slight modification to the previous post to allow for empty array elements
added the following lines after the first preg_match block
<?php
} else if ($expecting == 2 && preg_match('/^\[(.+?)\] \=\>$/', $trim, $matches)) { // array element
// the array element is blank
list ($fullMatch, $key) = $matches;
$topArray[$key] = $element;
}
?>
print_r
(PHP 4, PHP 5)
print_r — 指定した変数に関する情報を解りやすく出力する
説明
mixed print_r
( mixed $expression
[, bool $return
] )
print_r() は、 変数の値に関する情報を解り易い形式で表示します。
print_r()、var_dump() および var_export() は、PHP 5 においてオブジェクトの protected および private のプロパティも表示します。
print_r() は、配列ポインタを終端まで移動する ことに注意してください。ポインタを最初に戻すために reset() を使用してください。
パラメータ
- expression
-
表示したい式。
- return
-
print_r() の結果を取得したい場合には return 引数を試用してください。 print_r() はデフォルトでは結果を直接表示してしまいますが この引数が TRUE の場合には結果を戻します。
返り値
string、integer, float を指定した場合はその値が出力されます。 array を指定した場合、キーと要素を表す形式で値が 表示されます。object に関しても同様の表示形式となります。
注意
注意: この関数は、 このパラメータに対して内部的に出力バッファリングを使用しています。 そのため、ob_start() コールバック関数の中で使用することはできません。
変更履歴
| バージョン | 説明 |
|---|---|
| 4.3.0 | return 引数が PHP 4.3.0 以降追加されました。 PHP4.3.0 より前のバージョンを使っている場合で print_r() の結果を取得したい場合には、 出力制御関数を使用してください。 |
| 4.0.4 | PHP 4.0.4 より前のバージョンでは、自分自身への直接または間接の 参照を含む array または object が指定された 場合には、無限に print_r() が実行されてしまいました。 print_r($GLOBALS) が例で、 $GLOBALS はそれ自体自分自身への参照を有する グローバル変数です。 |
例
Example#1 print_r() の例
<pre>
<?php
$a = array ('a' => 'apple', 'b' => 'banana', 'c' => array ('x', 'y', 'z'));
print_r ($a);
?>
</pre>
上の例の出力は以下となります。
<pre> Array ( [a] => apple [b] => banana [c] => Array ( [0] => x [1] => y [2] => z ) ) </pre>
Example#2 return 引数の例
<?php
$b = array ('m' => 'monkey', 'foo' => 'bar', 'x' => array ('x', 'y', 'z'));
$results = print_r($b, true); // print_r の結果が $results に格納されます
?>
print_r
helpful at maybe dot com
07-Mar-2008 01:13
07-Mar-2008 01:13
anon at anon dot com
01-Mar-2008 03:30
01-Mar-2008 03:30
A slight modification to the previous post to allow for arrays containing mutli line strings. haven't fully tested it with everything, but seems to work great for the stuff i've done so far.
<?php
function print_r_reverse(&$output)
{
$expecting = 0; // 0=nothing in particular, 1=array open paren '(', 2=array element or close paren ')'
$lines = explode("\n", $output);
$result = null;
$topArray = null;
$arrayStack = array();
$matches = null;
while (!empty($lines) && $result === null)
{
$line = array_shift($lines);
$trim = trim($line);
if ($trim == 'Array')
{
if ($expecting == 0)
{
$topArray = array();
$expecting = 1;
}
else
{
trigger_error("Unknown array.");
}
}
else if ($expecting == 1 && $trim == '(')
{
$expecting = 2;
}
else if ($expecting == 2 && preg_match('/^\[(.+?)\] \=\> (.+)$/', $trim, $matches)) // array element
{
list ($fullMatch, $key, $element) = $matches;
if (trim($element) == 'Array')
{
$topArray[$key] = array();
$newTopArray =& $topArray[$key];
$arrayStack[] =& $topArray;
$topArray =& $newTopArray;
$expecting = 1;
}
else
{
$topArray[$key] = $element;
}
}
else if ($expecting == 2 && $trim == ')') // end current array
{
if (empty($arrayStack))
{
$result = $topArray;
}
else // pop into parent array
{
// safe array pop
$keys = array_keys($arrayStack);
$lastKey = array_pop($keys);
$temp =& $arrayStack[$lastKey];
unset($arrayStack[$lastKey]);
$topArray =& $temp;
}
}
// Added this to allow for multi line strings.
else if (!empty($trim) && $expecting == 2)
{
// Expecting close parent or element, but got just a string
$topArray[$key] .= "\n".$line;
}
else if (!empty($trim))
{
$result = $line;
}
}
$output = implode(n, $lines);
return $result;
}
/**
* @param string $output : The output of a multiple print_r calls, separated by newlines
* @return mixed[] : parseable elements of $output
*/
function print_r_reverse_multiple($output)
{
$result = array();
while (($reverse = print_r_reverse($output)) !== NULL)
{
$result[] = $reverse;
}
return $result;
}
$output = '
Array
(
[a] => apple
[b] => banana
[c] => Array
(
[0] => x
[1] => y
[2] => z
[3] => Array
(
[nest] => yes
[nest2] => Array
(
[nest] => some more
asffjaskkd
)
[nest3] => o rly?
)
)
)
some extra stuff
';
var_dump(print_r_reverse($output), $output);
?>
This should output
array(3) {
["a"]=>
string(5) "apple"
["b"]=>
string(6) "banana"
["c"]=>
array(4) {
[0]=>
string(1) "x"
[1]=>
string(1) "y"
[2]=>
string(1) "z"
[3]=>
array(3) {
["nest"]=>
string(3) "yes"
["nest2"]=>
array(1) {
["nest"]=>
string(40) "some more
asffjaskkd"
}
["nest3"]=>
string(6) "o rly?"
}
}
}
string(18) "nsome extra stuffn"
Added:
else if (!empty($trim) && $expecting == 2)
{
// Expecting close parent or element, but got just a string
$topArray[$key] .= "\n".$line;
}
ario at mail dot utexas dot [education - 3 letters]
20-Feb-2008 05:34
20-Feb-2008 05:34
This is a better print_r reverse algorithm, that works with arbitrary nested arrays. Anything else it treats as strings. The second function allows you to take a string with multiple print_r results concatenated, and returns the result of parsing each of them.
<?php
/**
* @param string &$output : The output of a print_r call; this parameter is DESTRUCTIVE, and will be set to the remainder
* of $output which is not parsed.
* @return mixed : the first parseable element of $output
*/
function print_r_reverse(&$output)
{
$expecting = 0; // 0=nothing in particular, 1=array open paren '(', 2=array element or close paren ')'
$lines = explode("\n", $output);
$result = null;
$topArray = null;
$arrayStack = array();
$matches = null;
while (!empty($lines) && $result === null)
{
$line = array_shift($lines);
$trim = trim($line);
if ($trim == 'Array')
{
if ($expecting == 0)
{
$topArray = array();
$expecting = 1;
}
else
{
trigger_error("Unknown array.");
}
}
else if ($expecting == 1 && $trim == '(')
{
$expecting = 2;
}
else if ($expecting == 2 && preg_match('/^\[(.+?)\] \=\> (.+)$/', $trim, $matches)) // array element
{
list ($fullMatch, $key, $element) = $matches;
if (trim($element) == 'Array')
{
$topArray[$key] = array();
$newTopArray =& $topArray[$key];
$arrayStack[] =& $topArray;
$topArray =& $newTopArray;
$expecting = 1;
}
else
{
$topArray[$key] = $element;
}
}
else if ($expecting == 2 && $trim == ')') // end current array
{
if (empty($arrayStack))
{
$result = $topArray;
}
else // pop into parent array
{
// safe array pop
$keys = array_keys($arrayStack);
$lastKey = array_pop($keys);
$temp =& $arrayStack[$lastKey];
unset($arrayStack[$lastKey]);
$topArray =& $temp;
}
}
else if (!empty($trim))
{
$result = $line;
}
}
$output = implode(n, $lines);
return $result;
}
/**
* @param string $output : The output of a multiple print_r calls, separated by newlines
* @return mixed[] : parseable elements of $output
*/
function print_r_reverse_multiple($output)
{
$result = array();
while (($reverse = print_r_reverse($output)) !== NULL)
{
$result[] = $reverse;
}
return $result;
}
$output = '
Array
(
[a] => apple
[b] => banana
[c] => Array
(
[0] => x
[1] => y
[2] => z
[3] => Array
(
[nest] => yes
[nest2] => Array
(
[nest] => some more
)
[nest3] => o rly?
)
)
)
some extra stuff
';
var_dump(print_r_reverse($output), $output);
?>
The above example will output:
array(3) {
["a"]=>
string(5) "apple"
["b"]=>
string(6) "banana"
["c"]=>
array(4) {
[0]=>
string(1) "x"
[1]=>
string(1) "y"
[2]=>
string(1) "z"
[3]=>
array(3) {
["nest"]=>
string(3) "yes"
["nest2"]=>
array(1) {
["nest"]=>
string(9) "some more"
}
["nest3"]=>
string(6) "o rly?"
}
}
}
string(20) "
some extra stuff
"
Goose
07-Feb-2008 08:31
07-Feb-2008 08:31
A one line command that serves to nl2br but have it so it displays in html is
function nl2br2($arg){print(nl2br(str_replace(' ',' ',print_r($arg,true))));}
Kokos
31-Jan-2008 09:52
31-Jan-2008 09:52
A simple function that will output an array more easily to read than print_r();
<?php
function echo_array($array,$return_me=false){
if(is_array($array) == false){
$return = "The provided variable is not an array.";
}else{
foreach($array as $name=>$value){
if(is_array($value)){
$return .= "";
$return .= "['<b>$name</b>'] {<div style='margin-left:10px;'>\n";
$return .= echo_array($value,true);
$return .= "</div>}";
$return .= "\n\n";
}else{
if(is_string($value)){
$value = "\"$value\"";
}
$return .= "['<b>$name</b>'] = $value\n\n";
}
}
}
if($return_me == true){
return $return;
}else{
echo "<pre>".$return."</pre>";
}
}
?>
highstrike at gmail dot com
08-Jan-2008 10:34
08-Jan-2008 10:34
made 2 nifty functions based of what some people contributed here. Hope you find them usefull
usage ... call for the dump function. EG: dump($array, "Array dump");
<?php
////////////////////////////////////////////////////////
// Function: dump
// Inspired from: PHP.net Contributions
// Description: Helps with php debugging
function dump(&$var, $info = FALSE)
{
$scope = false;
$prefix = 'unique';
$suffix = 'value';
if($scope) $vals = $scope;
else $vals = $GLOBALS;
$old = $var;
$var = $new = $prefix.rand().$suffix; $vname = FALSE;
foreach($vals as $key => $val) if($val === $new) $vname = $key;
$var = $old;
echo "<pre style='margin: 0px 0px 10px 0px; display: block; background: white; color: black; font-family: Verdana; border: 1px solid #cccccc; padding: 5px; font-size: 10px; line-height: 13px;'>";
if($info != FALSE) echo "<b style='color: red;'>$info:</b><br>";
do_dump($var, '$'.$vname);
echo "</pre>";
}
////////////////////////////////////////////////////////
// Function: do_dump
// Inspired from: PHP.net Contributions
// Description: Better GI than print_r or var_dump
function do_dump(&$var, $var_name = NULL, $indent = NULL, $reference = NULL)
{
$do_dump_indent = "<span style='color:#eeeeee;'>|</span> ";
$reference = $reference.$var_name;
$keyvar = 'the_do_dump_recursion_protection_scheme'; $keyname = 'referenced_object_name';
if (is_array($var) && isset($var[$keyvar]))
{
$real_var = &$var[$keyvar];
$real_name = &$var[$keyname];
$type = ucfirst(gettype($real_var));
echo "$indent$var_name <span style='color:#a2a2a2'>$type</span> = <span style='color:#e87800;'>&$real_name</span><br>";
}
else
{
$var = array($keyvar => $var, $keyname => $reference);
$avar = &$var[$keyvar];
$type = ucfirst(gettype($avar));
if($type == "String") $type_color = "<span style='color:green'>";
elseif($type == "Integer") $type_color = "<span style='color:red'>";
elseif($type == "Double"){ $type_color = "<span style='color:#0099c5'>"; $type = "Float"; }
elseif($type == "Boolean") $type_color = "<span style='color:#92008d'>";
elseif($type == "NULL") $type_color = "<span style='color:black'>";
if(is_array($avar))
{
$count = count($avar);
echo "$indent" . ($var_name ? "$var_name => ":"") . "<span style='color:#a2a2a2'>$type ($count)</span><br>$indent(<br>";
$keys = array_keys($avar);
foreach($keys as $name)
{
$value = &$avar[$name];
do_dump($value, "['$name']", $indent.$do_dump_indent, $reference);
}
echo "$indent)<br>";
}
elseif(is_object($avar))
{
echo "$indent$var_name <span style='color:#a2a2a2'>$type</span><br>$indent(<br>";
foreach($avar as $name=>$value) do_dump($value, "$name", $indent.$do_dump_indent, $reference);
echo "$indent)<br>";
}
elseif(is_int($avar)) echo "$indent$var_name = <span style='color:#a2a2a2'>$type(".strlen($avar).")</span> $type_color$avar</span><br>";
elseif(is_string($avar)) echo "$indent$var_name = <span style='color:#a2a2a2'>$type(".strlen($avar).")</span> $type_color\"$avar\"</span><br>";
elseif(is_float($avar)) echo "$indent$var_name = <span style='color:#a2a2a2'>$type(".strlen($avar).")</span> $type_color$avar</span><br>";
elseif(is_bool($avar)) echo "$indent$var_name = <span style='color:#a2a2a2'>$type(".strlen($avar).")</span> $type_color".($avar == 1 ? "TRUE":"FALSE")."</span><br>";
elseif(is_null($avar)) echo "$indent$var_name = <span style='color:#a2a2a2'>$type(".strlen($avar).")</span> {$type_color}NULL</span><br>";
else echo "$indent$var_name = <span style='color:#a2a2a2'>$type(".strlen($avar).")</span> $avar<br>";
$var = $var[$keyvar];
}
}
?>
bart at mediawave dot nl
31-Oct-2007 09:27
31-Oct-2007 09:27
Here's a PHP version of print_r which can be tailored to your needs. Shows protected and private properties of objects and detects recursion (for objects only!). Usage:
void u_print_r ( mixed $expression [, array $ignore] )
Use the $ignore parameter to provide an array of property names that shouldn't be followed recursively.
<?php
function u_print_r($subject, $ignore = array(), $depth = 1, $refChain = array())
{
if ($depth > 20) return;
if (is_object($subject)) {
foreach ($refChain as $refVal)
if ($refVal === $subject) {
echo "*RECURSION*\n";
return;
}
array_push($refChain, $subject);
echo get_class($subject) . " Object ( \n";
$subject = (array) $subject;
foreach ($subject as $key => $val)
if (is_array($ignore) && !in_array($key, $ignore, 1)) {
echo str_repeat(" ", $depth * 4) . '[';
if ($key{0} == "\0") {
$keyParts = explode("\0", $key);
echo $keyParts[2] . (($keyParts[1] == '*') ? ':protected' : ':private');
} else
echo $key;
echo '] => ';
u_print_r($val, $ignore, $depth + 1, $refChain);
}
echo str_repeat(" ", ($depth - 1) * 4) . ")\n";
array_pop($refChain);
} elseif (is_array($subject)) {
echo "Array ( \n";
foreach ($subject as $key => $val)
if (is_array($ignore) && !in_array($key, $ignore, 1)) {
echo str_repeat(" ", $depth * 4) . '[' . $key . '] => ';
u_print_r($val, $ignore, $depth + 1, $refChain);
}
echo str_repeat(" ", ($depth - 1) * 4) . ")\n";
} else
echo $subject . "\n";
}
?>
Example:
<?php
class test {
public $var1 = 'a';
protected $var2 = 'b';
private $var3 = 'c';
protected $array = array('x', 'y', 'z');
}
$test = new test();
$test->recursiveRef = $test;
$test->anotherRecursiveRef->recursiveRef = $test;
$test->dont->follow = 'me';
u_print_r($test, array('dont'));
?>
Will produce:
test Object (
[var1] => a
[var2:protected] => b
[var3:private] => c
[array:protected] => Array (
[0] => x
[1] => y
[2] => z
)
[recursiveRef] => *RECURSION*
[anotherRecursiveRef] => stdClass Object (
[recursiveRef] => *RECURSION*
)
)
php at deboom dot biz
21-Sep-2007 09:17
21-Sep-2007 09:17
If you need to import an print_R output back to an array you could use this.
This could also be (ab)used to convert a object into a array...
<?php
function object2array($printr) {
$newarray = array();
$a[0] = &$newarray;
if (preg_match_all('/^\s+\[(\w+).*\] => (.*)\n/m', $printr, $match)) {
foreach ($match[0] as $key => $value) {
(int)$tabs = substr_count(substr($value, 0, strpos($value, "[")), " ");
if ($match[2][$key] == 'Array' || substr($match[2][$key], -6) == 'Object') {
$a[$tabs+1] = &$a[$tabs][$match[1][$key]];
}
else {
$a[$tabs][$match[1][$key]] = $match[2][$key];
}
}
}
return $newarray;
}
?>
motin at demomusic dot nu
20-Jun-2007 08:01
20-Jun-2007 08:01
This works around the hacky nature of print_r in return mode (using output buffering for the return mode to work is hacky...):
<?php
/**
* An alternative to print_r that unlike the original does not use output buffering with
* the return parameter set to true. Thus, Fatal errors that would be the result of print_r
* in return-mode within ob handlers can be avoided.
*
* Comes with an extra parameter to be able to generate html code. If you need a
* human readable DHTML-based print_r alternative, see http://krumo.sourceforge.net/
*
* Support for printing of objects as well as the $return parameter functionality
* added by Fredrik Wollsén (fredrik dot motin at gmail), to make it work as a drop-in
* replacement for print_r (Except for that this function does not output
* paranthesises around element groups... ;) )
*
* Based on return_array() By Matthew Ruivo (mruivo at gmail)
* (http://se2.php.net/manual/en/function.print-r.php#73436)
*/
function obsafe_print_r($var, $return = false, $html = false, $level = 0) {
$spaces = "";
$space = $html ? " " : " ";
$newline = $html ? "<br />" : "\n";
for ($i = 1; $i <= 6; $i++) {
$spaces .= $space;
}
$tabs = $spaces;
for ($i = 1; $i <= $level; $i++) {
$tabs .= $spaces;
}
if (is_array($var)) {
$title = "Array";
} elseif (is_object($var)) {
$title = get_class($var)." Object";
}
$output = $title . $newline . $newline;
foreach($var as $key => $value) {
if (is_array($value) || is_object($value)) {
$level++;
$value = obsafe_print_r($value, true, $html, $level);
$level--;
}
$output .= $tabs . "[" . $key . "] => " . $value . $newline;
}
if ($return) return $output;
else echo $output;
}
?>
Built on a function earlier posted in these comments as stated in the Doc comment. Cheers! /Fredrik (Motin)
mrasnika at users dot sourceforge dot net
27-Apr-2007 03:30
27-Apr-2007 03:30
We can all agree that print_r() output is very spartan looking. The debug data needs to be organized better, and presented in a graceful way. In the era of Web 2.0 it is somewhat strange to use plain text to dump information. A DHTML powered informatiion dumping tool will be quite better - like the the open-source alternative of print_r(); -- Krumo (http://krumo.sourceforge.net).
It renders the output using DHTML and collapsible nodes, it's layout is "skinable" and you can change it to fit your aesthetic taste. Krumo makes the output "human-readable" for real :) Plus it is compliant with both PHP4 and PHP5. Plus it detects "reference recursion". Plus you can use it to dump all various sort of data like debug back-traces, the superglobals ($_SERVER, $_ENV, $_REQUEST, $_COOKIE, $_GET, $_POST, $_SESSION), all the included files, all the declared classes, all the declared constants, all your PHP settings, all your php.ini values (if it is readable), all the loaded extensions, all the HTTP request headers, all the declared interfaces (for PHP5), all the file paths from INCLUDE_PATH, all the values of any particular INI file. Additionally it is designed to be easy to use - for example you can disable all the Krumo dumps instead of cleaning your code out of all print_r()'s and var_dump()'s. Anyway, if you check the site (http://krumo.sourceforge.net), you can found a lot of examples, demonstrations, documentation and all sort of helpful information.
Enthusiastic PHPers
23-Mar-2007 05:03
23-Mar-2007 05:03
We had an interesting problem dumping an object that
contained embedded HTML. The application makes use
of buffer manipulation functions, so print_r's 2nd argument
wasn't helpful. Here is how we solved the problem:
$object = new ObjectContainingHTML();
$savedbuffercontents = ob_get_clean();
print_r($object);
$print_r_output = ob_get_clean();
ob_start();
echo $savedbuffercontents;
echo htmlentities($print_r_output);
mading25 at hotmail dot com
02-Mar-2007 04:34
02-Mar-2007 04:34
None of the function to output to HTML was working for me so I had to write something that suited my needs. It's probably super not efficient but, hey it works well for me on a small scale.
function print_r_html($data,$return_data=false)
{
$data = print_r($data,true);
$data = str_replace( " "," ", $data);
$data = str_replace( "\r\n","<br>\r\n", $data);
$data = str_replace( "\r","<br>\r", $data);
$data = str_replace( "\n","<br>\n", $data);
if (!$return_data)
echo $data;
else
return $data;
}
Simple, isn't? :)
Matthew Ruivo (mruivo at gmail)
23-Feb-2007 03:47
23-Feb-2007 03:47
For those of you needing to print an array within a buffer callback function, I've created this quick function. It simply returns the array as a readable string rather than printing it. You can even choose whether to return it in normal text-mode or HTML. It's recursive, so multi-dimensial arrays are supported. I hope someone finds this useful!
<?php
function return_array($array, $html = false, $level = 0) {
$space = $html ? " " : " ";
$newline = $html ? "<br />" : "\n";
for ($i = 1; $i <= 6; $i++) {
$spaces .= $space;
}
$tabs = $spaces;
for ($i = 1; $i <= $level; $i++) {
$tabs .= $spaces;
}
$output = "Array" . $newline . $newline;
foreach($array as $key => $value) {
if (is_array($value)) {
$level++;
$value = return_array($value, $html, $level);
$level--;
}
$output .= $tabs . "[" . $key . "] => " . $value . $newline;
}
return $output;
}
?>
sakabako at gmail dot com
08-Feb-2007 05:45
08-Feb-2007 05:45
I've got four functions for printing arrays out in a readable fashion, I hope someone finds them useful.
//prints an array in a HTML table. Top row is the keys.
function table( $array ) {
$array = array_values( $array );
$keys = array_keys( $array[0] );
echo '<table border="1"><tr>';
foreach( $keys as $key ) {
echo '<td>'.$key.'</td>';
}
echo '</tr>';
foreach( $array as $row ) {
echo '<tr>';
foreach( $row as $value ) {
echo '<td>'.$value.'</td>';
}
echo '</tr>';
}
echo '</table>';
}
//print_r enclosed in a <pre>, except it will always print something, even if the variable is null, number 0 or false. It also lets you label the dump.
function dump( $var, $label=null ) {
if( $var === '' or $var === null or $var === 0 ) {
var_dump( $var );
return;
}
echo '<pre style="text-align: left; font-size: 10px;">';
if( $label ) {
echo $label."\n";
}
print_r( $var );
echo '</pre>';
}
//This one gives you output you can copy and paste back into your PHP code to recreate the array.
function dump_array( $array, $tabs=1 ) {
$html = "<pre style=\"text-align: left; font-size: 10px;\">array( \n";
foreach( $array as $key => $val ) {
$html .= str_repeat( "\t", $tabs )."'$key' => ";
if( is_array( $val ) ) {
$html .= dump_array( $array, $tabs+1 );
} else {
$html .= "'$val',\n";
}
}
$html .= ')</pre>';
return $html;
}
//just add header( 'content-type: application/vnd.ms-excel' ) and you've got an excel file.
function excel( $array ) {
$array = array_values( $array );
$keys = array_keys( $array[0] );
foreach( $keys as $key ) {
echo $key."\t";
}
echo "\n";
foreach( $array as $row ) {
foreach( $row as $value ) {
echo $value."\t";
}
echo "\n";
}
}
markus (at) maxxmaster (dot) org
17-Jan-2007 11:11
17-Jan-2007 11:11
i've been using a similar idea like Sawey's for quite a long time,
but was always disappointed that you don't see the name of the
variable passed to the function (eg calling it many times, you don't
know which value was provided by a certain variable at a certain time).
so i combined sawey's idea with one found on php.net to solve that problem.
for shellscripting the function only uses <pre>-tags when called in the web.
<?php
/* how print_r should be ;) */
function my_r(&$var, $scope=false, $label=false){
if (is_string($scope) && $label==false) $label=$scope;
if (!is_array($scope)) $scope = &$GLOBALS;
$origin = $var;
$var = $checker = "very_weird_value#".rand()."#isnt_it";
$vname = false;
foreach ($scope as $key => $value){
if ($value === $checker){ $vname = "\$".$key; }
if (is_array($value) && $key!="GLOBALS"){
if ($pfad=aver($var,$value)){
$vname = "\$${key}[\"". implode("\"][\"",$pfad)."\"]";
}
}
if (is_object($value)){
if ($pfad=aver($var,get_object_vars($value))){
if (sizeof($pfad)<2) $vname = "\$${key}->".$pfad[0];
else{
$vname ="\$${key}->".$pfad[0];
$vname.="[\"".implode("\"][\"", array_slice($pfad,1))."\"]";
}
}
}
if ($vname) break;
}
$var = $origin;
if ($_SERVER["SERVER_NAME"] && !isset($_SERVER["TERM"])) echo "<pre>";
if ($vname){
echo $vname;
if ($label) echo " #" . $label . "# ";
else echo ": ";
}else{
if ($label) echo "$label: ";
}
print_r($var);
if ($_SERVER["SERVER_NAME"] && !isset($_SERVER["TERM"])) echo "</pre>";
}
/* this function is needed to check in multidimensional arrays
if the value of interest exists. if yes, the path is returned */
function aver($needle,$haystack) { // array value exists recursive
foreach($haystack as $key=>$val) {
if(is_array($val) && $needle != $val && $key != "GLOBALS") {
if($foo=aver($needle,$val)) return array_merge(array($key),$foo);
}elseif($val === $needle) return array($key);
}
return false;
}
?>
markus (at) maxxmaster (d0t) org
17-Jan-2007 10:33
17-Jan-2007 10:33
Explanation:
The problem with figuring out what value is what key in that variables scope is that several variables might have the same value. To remedy this, the variable is passed by reference and its value is then modified to a random value to make sure there will be a unique match. Then we loop through the scope ( semi recursively ) the variable is contained in and when there is a match of our modified value, we can grab the correct key and output the name.
Bugs:
You can see in the 5th Example, that the so-called non-existant variable infact exists ;|, the problem with referenced variables (as used in the my_r function) is, that they have to exist at call-time to reference them. that is why my_r("test") will result in a fatal error. if you have ideas to solve that, don't hesitate to mention them.
Examples:
1. Use of a variable contained in the global scope (default):
<?php
$my_global_variable = array("nice", "try", "guybrush");
my_r($my_global_variable);
/* Outputs:
$my_global_variable: Array
(
[0] => nice
[1] => try
[2] => guybrush
)
*/
?>
2. Use of a local variable (in a function):
<?php
function my_local_function()
{
$my_local_variable = array("nice", "try", "guybrush");
my_r($my_local_variable,get_defined_vars());
}
my_local_function();
/* Outputs:
$my_local_variable: Array
(
[0] => nice
[1] => try
[2] => guybrush
)
*/
?>
3. Use of an object property:
<?php
class myclass{
public function __constructor(){ // depending on php version ;)
$this->my_object_property = array("nice", "try", name => array("guybrush"));
}
public function myclass(){ // depending on php version ;)
$this->my_object_property = array("nice", "try", name => array("guybrush"));
}
}
$obj = new myclass;
my_r($obj->my_object_property);
/* Outputs:
$obj->my_object_property: Array
(
[0] => nice
[1] => try
[name] => Array
(
[0] => guybrush
)
)
*/
?>
4. Use of a sub-array and an additional label
<?php
$foo=array("nice","try",name => array("guybrush","threapwood"))
my_r($foo["name"],"position 1");
/* Outputs:
$foo["name"] #position 1# Array
(
[0] => guybrush
[1] => threapwood
)
*/
?>
5. Use of non existant Variables (standard-behaviour of print_r)
<?php
my_r($foo=array("nice","try","guybrush"));
/* Outputs:
Array
(
[0] => nice
[1] => try
[2] => guybrush
)
*/
?>
SaWey @ localdomain
16-Jan-2007 04:44
16-Jan-2007 04:44
I've seen a lot of tries to give an easy way to output the "print_r" info in a decent way in you favorite browser.
Here's mine:
echo ("<pre>");
print_r("-->here goes your data to output<--");
echo ("<pre>");
I personaly think this is the easyest way.
Grz
auditor400 at gmail dot com
03-Nov-2006 12:56
03-Nov-2006 12:56
some functions I find useful for debugging.
/**
* dump the object in a base.class.php :: print_r2() fashon
this function is for debugging purposes only (obviously)
@see d2()
@param $obj an array of elements, that may have elements that are also arrays.
@param $color the color of the output (useful, when you need to call this several times,
and you need a certain structure to stand out from the others, or simply to differentiate them)
color-coding stuff is a great wa to work, consider this:
@code
p2($struct,'red');
@endcode
to find the function call, just search "red".
in case you find yourself lost, you can always sue the line numbers, @see $dinfo
@param $dinfo see http://www.php.net/debug_backtrace for nifo on debug info.,
0: no info, 1: function call, 2: full backtrace.
@param $title simple remarks you can put to aid you in development. i.e.
@code
$a=array(1,2,3,5,6)
//this
p2($a,'',0,'the numbers');
//is more meaningful than this:
p2($a);
@code
This is particulary true when dealing with many p2()
It is recomended that you *don't* delete p2()'s calls from your code,
but rather document them:
@code
//insightfull comments about spected output
//p2($a123,'',1,'Items in list')
@endcode
or, if you feel more confortable with logging, use this:
$this->log(gp2($struct)); @see gp2()
You can also use p2() as a call trace: helper
@code
function a(){
b();
}
function b(){
c();
}
function d(){
a();
}
function c(){
p2(1,'',2,'backtrace');
}
d();
@endcode
note the use of p2(1), as a simple backtrace enables, you can use
p2($anything,'',2) to display the log, or p2($anything) to show the call route.
the call route follows the following format:
@ file : function : function_call_line_number -> current_line_number
i.e.
@std.php:filter_link():1222->2142
where current line number is the line where the p2() call is, and "function call number"
is the line where the current function was called from (useful as hell).
--
* */
function p2($obj,$color='black',$dinfo=1,$title=''){
//echo();
$dbg=debug_backtrace();
if($dinfo!=0){
//':'.$dbg[1]['class'].
$dinfo="@".basename($dbg[1]['file']).':'.$dbg[1]['function'].'():'.
$dbg[1]['line'].'->'.$dbg[0]['line']."\n";
}
if($dinfo==2){
$dinfo.=print_r(debug_backtrace(),true);
}
if($color==''){$color='rgb(50,50,200)';}
echo("<h3 style='color:$color'>".$title.'</h3><xmp style="color:'.$color.'">'.
$dinfo.print_r($obj,1)."</xmp>");
}
function gp2($obj,$color='black'){
return("<xmp style='color:$color'>".print_r($obj,1)."</xmp>");
}
/**
* @see d2()
* */
function d2_recursive($obj,$label='',$color='rgb(100,100,100)'){
if(is_array($obj)){
$dx="\n<table style='border:1px solid ".$color."' cellspacing=0 cellpadding=2 width=100%>";
if($label!=''){
$dx.="\n<tr><td style='background-color:".$color.";border:1px solid ".$color.
"' colspan=2>".$label."</td></tr>";
}
foreach($obj as $k=>$v){
$dx.="\n<tr><td style='width:1%;color:white;font-weight:bold;font-family:verdana;".
"font-size:10pt;background-color:".$color.";border:1px solid ".$color."'>".$k
.'</td><td style="border:1px solid '.$color.'">';
$dx.=d2_recursive($v,'',$color)."</td></tr>";
}
$dx.="\n</table>";
}else{
$dx=$obj;
}
return($dx);
}
/** \brief nice html object inspector
* @see p2()
* */
function d2($obj,$label='',$color='black'){
echo("\n<!--DUMP:$label START-->\n".d2_recursive($obj,$label,$color)."\n<!--DUMP END-->\n");
}
Dmitry Kochin <dco at mail dot ru>
08-Sep-2006 05:20
08-Sep-2006 05:20
Sometimes print_r produces large output, especially when the data hierarchy is too deep. It is very difficult to analyze the dump about 1Mb length.
It would be great to have some way to fold arrays and objects and to look deeper into hierarchy only on demand.
Here is the solution. Just pass the print_r output to debug_var function:
debug_var('title', print_r($var, true));
and it will produce nice html with folding option.
<?php
ob_start();
?>
Locals: Array
(
[arr] => Array
(
[0] => Bon Object
(
[n] => id
[v] => 1
[dv] =>
[dn] =>
)
)
[b] => Bon Object
(
[n] => id
[v] => 1
[dv] =>
[dn] =>
)
[k] => 0
[row] => Array
(
[aid] => 1
[bonus] => spell.id: 125;
[req] =>
[brcache] =>
[auto] => 0
)
[sp] =>
)
<?php
$str = ob_get_contents();
ob_end_clean();
debug_var('locals', $str);
function debug_var($name,$data)
{
$captured = preg_split("/\r?\n/",$data);
print "<script>function toggleDiv(num){
var span = document.getElementById('d'+num);
var a = document.getElementById('a'+num);
var cur = span.style.display;
if(cur == 'none'){
a.innerHTML = '-';
span.style.display = 'inline';
}else{
a.innerHTML = '+';
span.style.display = 'none';
}
}</script>";
print "<b>$name</b>\n";
print "<pre>\n";
foreach($captured as $line)
{
print debug_colorize_string($line)."\n";
}
print "</pre>\n";
}
function next_div($matches)
{
static $num = 0;
++$num;
return "$matches[1]<a id=a$num href=\"javascript: toggleDiv($num)\">+</a><span id=d$num style=\"display:none\">(";
}
/**
* colorize a string for pretty display
*
* @access private
* @param $string string info to colorize
* @return string HTML colorized
* @global
*/
function debug_colorize_string($string)
{
$string = preg_replace("/\[(\w*)\]/i", '[<font color="red">$1</font>]', $string);
$string = preg_replace_callback("/(\s+)\($/", 'next_div', $string);
$string = preg_replace("/(\s+)\)$/", '$1)</span>', $string);
/* turn array indexes to red */
/* turn the word Array blue */
$string = str_replace('Array','<font color="blue">Array</font>',$string);
/* turn arrows graygreen */
$string = str_replace('=>','<font color="#556F55">=></font>',$string);
return $string;
}
?>
This example uses ideas from this article:
http://www.zend.com/zend/tut/tutorial-DebugLib.php
ohira (atto) web. de
13-Apr-2006 11:01
13-Apr-2006 11:01
Bases on thbley´s sript i use this one to log some actions.
It will return a tabbed like string which you can output or whatever.
Input fields like "Password" will not be shown.
<?php
function print_r_string($arr,$first=true,$tab=0)
{
$output = "";
$tabsign = ($tab) ? str_repeat(' ',$tab) : '';
if ($first) $output .= "<pre><br>\n";
foreach($arr as $key => $val)
{
switch (gettype($val))
{
case "array":
$output .= $tabsign."[".htmlspecialchars($key)."] = array(".count($val).")<br>\n".$tabsign."(<br>\n";
$tab++;
$output .= print_r_string($val,false,$tab);
$tab--;
$output .= $tabsign.")<br>\n";
break;
case "boolean":
$output .= $tabsign."[".htmlspecialchars($key)."] bool = '".($val?"true":"false")."'<br>\n";
break;
case "integer":
$output .= $tabsign."[".htmlspecialchars($key)."] int = '".htmlspecialchars($val)."'<br>\n";
break;
case "double":
$output .= $tabsign."[".htmlspecialchars($key)."] double = '".htmlspecialchars($val)."'<br>\n";
break;
case "string":
$output .= $tabsign."[".htmlspecialchars($key)."] string = '".((stristr($key,'passw')) ? str_repeat('*', strlen($val)) : htmlspecialchars($val))."'<br>\n";
break;
default:
$output .= $tabsign."[".htmlspecialchars($key)."] unknown = '".htmlspecialchars(gettype($val))."'<br>\n";
break;
}
}
if ($first) $output .= "</pre><br>\n";
return $output;
}
echo print_r_string(array($_POST,$_GET)); // for Example
?>
sanya at hik dot hu
05-Apr-2006 11:13
05-Apr-2006 11:13
I find a possibly bug, when I wanted to print the structure of a DOMDocument or a DOMDocumentType object.
print_r() outputs the object type correctly, but the properties are missing.
$doc = $imp->createDocument();
$doc->loadXML($xmlString);
print_r($doc->doctype);
the code outputs:
DOMDocumentType Object
(
)
But the subobjects of $doc->doctype exist.
reinder at fake-address dot com
01-Feb-2006 02:09
01-Feb-2006 02:09
I always use this function in my code, because most of my functions return an Array or Boolean :
<?php
function printr ( $object , $name = '' ) {
print ( '\'' . $name . '\' : ' ) ;
if ( is_array ( $object ) ) {
print ( '<pre>' ) ;
print_r ( $object ) ;
print ( '</pre>' ) ;
} else {
var_dump ( $object ) ;
}
}
?>
( print_r gives no output on FALSE and that can be annoying! )
13-Dec-2005 06:00
function print_pre($var){
echo '<pre>';
print_r($var);
echo '</pre>'
}
thbley at gmail dot com
17-Nov-2005 05:10
17-Nov-2005 05:10
Here is a print_r that produces xml:
(now you can expand/collapse the nodes in your browser)
<?php
header('Content-Type: text/xml; charset=UTF-8');
echo print_r_xml($some_var);
function print_r_xml($arr,$first=true) {
$output = "";
if ($first) $output .= "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<data>\n";
foreach($arr as $key => $val) {
if (is_numeric($key)) $key = "arr_".$key; // <0 is not allowed
switch (gettype($val)) {
case "array":
$output .= "<".htmlspecialchars($key)." type='array' size='".count($val)."'>".
print_r_xml($val,false)."</".htmlspecialchars($key).">\n"; break;
case "boolean":
$output .= "<".htmlspecialchars($key)." type='bool'>".($val?"true":"false").
"</".htmlspecialchars($key).">\n"; break;
case "integer":
$output .= "<".htmlspecialchars($key)." type='integer'>".
htmlspecialchars($val)."</".htmlspecialchars($key).">\n"; break;
case "double":
$output .= "<".htmlspecialchars($key)." type='double'>".
htmlspecialchars($val)."</".htmlspecialchars($key).">\n"; break;
case "string":
$output .= "<".htmlspecialchars($key)." type='string' size='".strlen($val)."'>".
htmlspecialchars($val)."</".htmlspecialchars($key).">\n"; break;
default:
$output .= "<".htmlspecialchars($key)." type='unknown'>".gettype($val).
"</".htmlspecialchars($key).">\n"; break;
}
}
if ($first) $output .= "</data>\n";
return $output;
}
?>
jamin42b at gmail dot com
02-Sep-2005 09:52
02-Sep-2005 09:52
Here's a short function that can export php arrays to javascript arrays.
<?php
function php_to_js($array, $base) {
$js = '';
foreach ($array as $key=>$val) {
if (is_array($val)) {
$js .= php_to_js($val, $base.(is_numeric($key) ? '['.$key.']' : "['".addslashes($key)."']"));
} else {
$js .= $base;
$js .= is_numeric($key) ? '['.$key.']' : "['".addslashes($key)."']";
$js .= ' = ';
$js .= is_numeric($val) ? ''.$val.'' : "'".addslashes($val)."'";
$js .= ";\n";
}
}
return $base." = new Array();\n".$js;
}
?>
Example use:
<?php
$my_array = array('gdsag' => 4, 'hello', array(5, 6));
echo '<script>'.php_to_js($my_array).'</script>';
?>
This would output:
<script>
jsvarname = new Array();
jsvarname['gdsag'] = 4;
jsvarname[0] = 'hello';
jsvarname[1] = new Array();
jsvarname[1][0] = 5;
jsvarname[1][1] = 6;
</script>
Now the array is loaded in the browser as javascript. As you can see, it supports multidimensional arrays too.
warhog at warhog dot net
12-Aug-2005 09:01
12-Aug-2005 09:01
For very long arrays I have written a little function which formats an array quite nice and uses javascript for browsing it like a tree. The function is very customizable with the $style parameter.
For me it's of great use for browsing large array's, for example when those are used in language-files in some script and so on. It may even be used in "real" scripts for the "real" front-end, cause the tree can very easily be styled (look at the function or the outputted source and you'll see what i mean).
Here's the function:
<?php
function print_r_html($arr, $style = "display: none; margin-left: 10px;")
{ static $i = 0; $i++;
echo "\n<div id=\"array_tree_$i\" class=\"array_tree\">\n";
foreach($arr as $key => $val)
{ switch (gettype($val))
{ case "array":
echo "<a onclick=\"document.getElementById('";
echo array_tree_element_$i."').style.display = ";
echo "document.getElementById('array_tree_element_$i";
echo "').style.display == 'block' ?";
echo "'none' : 'block';\"\n";
echo "name=\"array_tree_link_$i\" href=\"#array_tree_link_$i\">".htmlspecialchars($key)."</a><br />\n";
echo "<div class=\"array_tree_element_\" id=\"array_tree_element_$i\" style=\"$style\">";
echo print_r_html($val);
echo "</div>";
break;
case "integer":
echo "<b>".htmlspecialchars($key)."</b> => <i>".htmlspecialchars($val)."</i><br />";
break;
case "double":
echo "<b>".htmlspecialchars($key)."</b> => <i>".htmlspecialchars($val)."</i><br />";
break;
case "boolean":
echo "<b>".htmlspecialchars($key)."</b> => ";
if ($val)
{ echo "true"; }
else
{ echo "false"; }
echo "<br />\n";
break;
case "string":
echo "<b>".htmlspecialchars($key)."</b> => <code>".htmlspecialchars($val)."</code><br />";
break;
default:
echo "<b>".htmlspecialchars($key)."</b> => ".gettype($val)."<br />";
break; }
echo "\n"; }
echo "</div>\n"; }
?>
The function as it is now does not support the $return parameter as print_r does and will create an endless loop like print_r did in php-versions < 4.0.3 when there is an element which contains a reference to a variable inside of the array to print out :-/
I've tested it with PHP 5.0.6 and PHP 4.2.3 - no problems except those already mentioned.
please e-mail me if you've got a solution for the problems i've mentioned, i myself are not able to solve them 'cause i don't know how the hell i can find out whether a variable is a reference or not.
nicky dot weber at siner dot de
11-Jun-2005 06:13
11-Jun-2005 06:13
Print arrays formatted for a browser easily:
<?php
function print_html_r( $aData ) {
echo nl2br( eregi_replace( " ", " ", print_r( $data, TRUE ) ) );
}
?>
general at NOSPAMbugfoo dot com
21-Jan-2005 06:23
21-Jan-2005 06:23
You can't use print_r($var, TRUE) inside a function which is a callback from ob_start() or you get the following error:
Fatal error: print_r(): Cannot use output buffering in output buffering display handlers