Hi, is my first note and I have problems with English, excuse me plis.
This is a function to remove an element of an associative array doing with de key, not with the value.
function ies_esborra_element_matriu($indice, &$matriu){
$matriu_keys = array_keys($matriu);
$matriu_temporal = $matriu;
while (is_numeric($i=array_search($indice,$matriu_keys))){
$matriu_part1 = array_slice($matriu_temporal, 0, $i );
$matriu_part2 = array_slice($matriu_temporal, $i+1, count($matriu_temporal)-1 );
$matriu_temporal = array_merge($matriu_part1, $matriu_part2);
$matriu_keys=array_keys($matriu_temporal);
}
return $matriu_temporal;
}
array_slice
(PHP 4, PHP 5)
array_slice — 配列の一部を展開する
説明
array array_slice ( array $array, int $offset [, int $length [, bool $preserve_keys]] )array_slice()は、array から引数 offset および length で指定された連続する要素を返します。
offset が負の値ではない場合、要素位置の計算は、 配列 array の offset から始められます。 offset が負の場合、要素位置の計算は array の最後から行われます。
lengthが指定され、正の場合、 連続する複数の要素が返されます。length が指定され、負の場合、配列の末尾から連続する複数の要素が返されます。 省略された場合、offset から配列の最後までの全ての要素が返されます。
array_slice() はデフォルトで配列の数値キーを リセットすることに注意してください。PHP 5.0.2 からは、 preserve_keys を TRUE にする事でこの動作を変更することができます。
例 273. array_slice() の例
<?php
$input = array("a", "b", "c", "d", "e");
$output = array_slice($input, 2); // "c", "d", "e" を返す
$output = array_slice($input, -2, 1); // "d" を返す
$output = array_slice($input, 0, 3); // "a", "b", "c" を返す
// 配列キーの違いに注意
print_r(array_slice($input, 2, -1));
print_r(array_slice($input, 2, -1, true));
?>
上の例の出力は以下となります。
Array
(
[0] => c
[1] => d
)
Array
(
[2] => c
[3] => d
)
array_splice() および unset() も参照ください。
array_slice
pfernan1 at xtec dot cat
19-Aug-2007 03:47
19-Aug-2007 03:47
phpnotasp at gmail dot com
17-Jul-2007 06:42
17-Jul-2007 06:42
It should be noted that this function does NOT modify the original array. So if you need to array_pop() or array_shift() without modifying the original array, you can use array_slice().
<?php
$input = array('a', 'b', 'c');
$output = array_slice($input, 1);
print_r($output);
print_r($input);
/*
Array
(
[0] => b
[1] => c
)
Array
(
[0] => a
[1] => b
[2] => c
)
*/
?>
sean at getclicky dot com
20-Jun-2007 04:54
20-Jun-2007 04:54
People... let's keep things simple here. :) Some of the functions to mimic >5.0.2 behavior (preserving keys) are ridiculously complicated. Look how simple it can be:
<?php
function atrim( $a, $num ) {
while( sizeof( $a ) > $num ) array_pop( $a );
return $a;
}
?>
cpa at NOSPAM dot conceptivator dot com
07-Jun-2007 09:15
07-Jun-2007 09:15
'gportlock at gembiz dot co dot uk' has an error in his limitText function. It simply takes a text string, then cuts off the first X words and returns the rest of the string. I believe the intended use is to return only the first X words and cut off the rest.
The correct version should be (notice the inserted 0 offset):
<?php
function limitText( $text, $wordCount )
{
$wordArray = explode(" ", $text);
array_splice($wordArray, 0, $wordCount);
return implode( " ", $wordArray );
}
?>
gportlock at gembiz dot co dot uk
24-May-2007 11:29
24-May-2007 11:29
This function returns a text string that is limited by the word count. This funtion is particularly useful for paid advertising where you pay by the word.
function limitText( $text, $wordCount ){
$wordArray = explode(" ", $text);
array_splice($wordArray, $wordCount);
return implode( " ", $wordArray );
}
bc at bnc-automatisering dot nl
15-Mar-2007 08:41
15-Mar-2007 08:41
first at all, ur php version check does not work correctly.
version 4.3.10 (4310 > 520)
Second, $a is not initialized.
Third, to let the function work the same as slice (offset) it should be:
function narray_slice($array, $offset, $length){
$a = 0;
foreach ($array as $key => $value) {
if (($a >= $offset) && ($a - $offset < $length))
$output_array[$key] = $value;
$a++;
}
return $output_array;
}
15-Mar-2007 01:09
I noticed that some other people made supportive functions for maintaining numeric keys for PHP versions less than 5.0.2. So here is my version of it.
<?php
//Slice an array but keep numeric keys
function narray_slice($array, $offset, $length) {
//Check if this version already supports it
if (str_replace('.', '', PHP_VERSION) >= 502)
return array_slice($array, $offset, $length, true);
foreach ($array as $key => $value) {
if ($a >= $offset && $a - $offset <= $length)
$output_array[$key] = $value;
$a++;
}
return $output_array;
}
?>
aflavio at gmail dot com
02-Mar-2007 06:43
02-Mar-2007 06:43
/**
* Remove a value from a array
* @param string $val
* @param array $arr
* @return array $array_remval
*/
function array_remval($val, &$arr)
{
$array_remval = $arr;
for($x=0;$x<count($array_remval);$x++)
{
$i=array_search($val,$array_remval);
if (is_numeric($i)) {
$array_temp = array_slice($array_remval, 0, $i );
$array_temp2 = array_slice($array_remval, $i+1, count($array_remval)-1 );
$array_remval = array_merge($array_temp, $array_temp2);
}
}
return $array_remval;
}
$stack=Array('apple','banana','pear','apple', 'cherry', 'apple');
array_remval("apple", $stack);
//output: Array('banana','pear', 'cherry')
Apware
16-Feb-2007 09:34
16-Feb-2007 09:34
A simple test of this function:
<?php
print_r(array_slice(array('a','b','c','d'), 0, 3)); // normal behaviour
print_r(array_slice(array('a','b','c','d'), 0, 10)); // result: no error, returns as many as possible
print_r(array_slice(array(), 0, 10)); // result: no error, returns empty array
?>
20-Dec-2006 02:10
The version check on "ps at b1g dot de" function fails on my copy of PHP. My Version of PHP is "4.3.10-18", and it ends up checking 4310 <=> 502.
Since we are looking for a version over 4.1.0, we cas use version_compare.
<?php
// PHP >= 5.0.2 is able to do this itself
if(function_exists('version_compare') and version_compare(PHP_VERSION, '5.0.2') >= 0) {
return array_slice($array, $offset, $length, true);
}
?>
ludvig ericson at http://toxik.a12.se/
05-Nov-2006 08:49
05-Nov-2006 08:49
This function can also be used for pure laziness,
<?php
$myVar = end(array_slice(anotherFunction(), 0, 1));
?>
Imagine that anotherFunction() returns, say, three indexes, and you are sure you only want the Nth index, you could use this as a poor man's way of getting by the fact that PHP can't do this:
<?php
$myVar = (anotherFunction())[1];
?>
Which is sad.
ps at b1g dot de
04-Nov-2006 07:44
04-Nov-2006 07:44
The following function is the same as array_slice with preserve_keys=true, but it works with PHP versions < 5.0.2.
When PHP >= 5.0.2 is available, the function uses the faster PHP-own array_slice-function with preserve_keys=true, otherwise it uses its own implementation.
<?php
/**
* array_slice with preserve_keys for every php version
*
* @param array $array Input array
* @param int $offset Start offset
* @param int $length Length
* @return array
*/
function array_slice_preserve_keys($array, $offset, $length = null)
{
// PHP >= 5.0.2 is able to do this itself
if((int)str_replace('.', '', phpversion()) >= 502)
return(array_slice($array, $offset, $length, true));
// prepare input variables
$result = array();
$i = 0;
if($offset < 0)
$offset = count($array) + $offset;
if($length > 0)
$endOffset = $offset + $length;
else if($length < 0)
$endOffset = count($array) + $length;
else
$endOffset = count($array);
// collect elements
foreach($array as $key=>$value)
{
if($i >= $offset && $i < $endOffset)
$result[$key] = $value;
$i++;
}
// return
return($result);
}
?>
Good for backwards compatibility I hope somebody might find this useful.
david at bagnara dot org
19-Oct-2006 12:42
19-Oct-2006 12:42
I was trying to pass an argument list through the constructors. I tried various things such as func_get_args(). My conclusion is to pass the args to the constructor as an array. Each constructor can remove the fields it wants and pass the array on.
Using the following prototype, each child class can have any number of parameters added to the beginning of the class constructor and the rest passed onto the parent.
If the default value is desired for an argument, just pass NULL.
This could possibly be better done with array_shift or the like.
<?php
class aChild extends aParent
{
// TODO customise this list for this class
public
$a, $b, $c;
function __construct( $args = array() )
{
//set up default values for this class
// TODO customise this list for this class
$default = array( "a-def", "b-def", "c-def" ) ;
// now overwrite the default with non NULL args
foreach( $args as $key=>$val )
{
// more args than needed?
if( !isset( $default[$key] ) )
{
break;
}
// this arg not null
if( isset( $val ) )
{
$default[$key] = $val ;
}
}
// set this to the new values
// TODO customise this list for this class
list( $this->a, $this->b, $this->c ) = $default ;
// take off the ones we used
$args = array_slice( $args, count( $default ) ) ;
parent::__construct( $args ) ;
}
}
$x = new aChild( array( "aChild a", NULL, "aChild c", NULL, "aParent second", "aParent third" ) ) ;
?>
DRB
25-Aug-2006 05:08
25-Aug-2006 05:08
In response to the problem mentioned in the previous post (no name 06-May-2006 12:21) the following is a working solution:
$myarray = array_slice($myarray, 1, count($myarray), true);
It is too bad that the "preserve_keys" option is not available for the array_shift and array_pop functions as this would be somewhat simpler.
06-May-2006 04:21
If you specify the fourth argument (to not reassign the keys), then there appears to be no way to get the function to return all values to the end of the array. Assigning -0 or NULL or just putting two commas in a row won't return any results.
taylorbarstow at the google mail service
08-Apr-2006 06:01
08-Apr-2006 06:01
Array slice function that works with associative arrays (keys):
function array_slice_assoc($array,$keys) {
return array_intersect_key($array,array_flip($keys));
}
andreasblixt (at) msn (dot) com
07-Sep-2005 01:53
07-Sep-2005 01:53
<?php
// Combines two arrays by inserting one into the other at a given position then returns the result
function array_insert($src, $dest, $pos) {
if (!is_array($src) || !is_array($dest) || $pos <= 0) return FALSE;
return array_merge(array_slice($dest, 0, $pos), $src, array_slice($dest, $pos));
}
?>
ssb45 at cornell dot edu
28-Jul-2005 11:20
28-Jul-2005 11:20
In reply to jenny at jennys dot info:
Here is a much easier way to find the $offset of a $key in an $array:
$offset = array_search($key, array_keys($array));
fanfatal at fanfatal dot pl
09-Jul-2005 07:09
09-Jul-2005 07:09
Hmm ... i wrote an usefull function whitch is such like strpos but it works on arrays ;]
<?php
/*
* Find position of first occurrence of a array
*
* @param array $haystack
* @param array $needle
* @return int
* @author FanFataL
*/
function array_pos($haystack, $needle) {
$size = count($needle);
$sizeh = count($haystack);
if($size > $sizeh) return false;
$scale = $sizeh - $size + 1;
for($i = 0; $i < $scale; $i++)
if($needle === array_slice($haystack, $i, $size))
return $i;
return false;
}
// Sample:
$a = array('aa','bb','cc','dd','ee');
$b = array('cc','dd');
$pos = array_pos($a, $b);
?>
Greatings ;-)
...
david dot tulloh at infaze dot com dot au
24-Jun-2005 10:26
24-Jun-2005 10:26
Nice one liner to extract a column from a 2D array.
It works by using array_slice on every row, through array_map.
<?php
// set up a small test environment
$test_subject[] = array("a", "b", "c");
$test_subject[] = array("d", "e", "f");
$column=1;
// do the actual work
$result = array_map('array_slice', $test_subject,
array_fill(0, count($test_subject), $column),
array_fill(0, count($test_subject), 1)
);
// and the end result
result == array ( array("b"), array("e") );
?>
liz at matrixmailing dot com
07-Jun-2005 06:16
07-Jun-2005 06:16
For those with PHP < 5.0.2, and have a number as your array key, to avoid having the key reset with array_slice, add a blank character to the beginning or end of the key.
<?
$array[" ".$key] = $value;
?>
bishop
09-Dec-2004 06:58
09-Dec-2004 06:58
Sometimes you need to pick certain non-integer and/or non-sequential keys out of an array. Consider using the array_pick() implementation below to pull specific keys, in a specific order, out of a source array:
<?php
$a = array ('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4);
$b = array_pick($a, array ('d', 'b'));
// now:
// $a = array ('a' => 1, 'c' => '3');
// $b = array ('d' => 4, 'b' => '2');
function &array_pick(&$array, $keys)
{
if (! is_array($array)) {
trigger_error('First parameter must be an array', E_USER_ERROR);
return false;
}
if (! (is_array($keys) || is_scalar($keys))) {
trigger_error('Second parameter must be an array of keys or a scalar key', E_USER_ERROR);
return false;
}
if (is_array($keys)) {
// nothing to do
} else if (is_scalar($keys)) {
$keys = array ($keys);
}
$resultArray = array ();
foreach ($keys as $key) {
if (is_scalar($key)) {
if (array_key_exists($key, $array)) {
$resultArray[$key] = $array[$key];
unset($array[$key]);
}
} else {
trigger_error('Supplied key is not scalar', E_USER_ERROR);
return false;
}
}
return $resultArray;
}
?>
pies at sputnik dot pl
18-Sep-2004 01:29
18-Sep-2004 01:29
My shot at Dams's array_slice_key() implementation:
function array_slice_key($array, $offset, $len=-1){
if (!is_array($array))
return FALSE;
$length = $len >= 0? $len: count($array);
$keys = array_slice(array_keys($array), $offset, $length);
foreach($keys as $key) {
$return[$key] = $array[$key];
}
return $return;
}
Samuele at norsam dot org
06-Apr-2004 01:44
06-Apr-2004 01:44
Note that if $offset+$length>count($array) then resulting array will NOT be filled with empty elements at his end, so it is not sure that it will have exactly $length elements. Example:
<?php
$a=Array(7,32,11,24,65); // count($a) is 5
$b=array_slice($a,2,4); // 2+4=6, and 6>count($a)
print_r($b);
?>
will return a 3-elements array:
Array
(
[0] => 11
[1] => 24
[2] => 65
)
24-Feb-2004 07:47
Use unset() to delete a associative array.
Ex:
<?php
$item['chaise'] = array ('qty' => 1,
'desc' => 'Chaise bercante 10"',
'avail' => 10);
$item['divan'] = array ('qty' => 1,
'desc' => 'Divan brun laitte"',
'avail' => 10);
if (isset($item['chaise'])) {
++$item['chaise']['qty'];
}
unset($item['divan']);
foreach ($item as $s) {
echo "<br />Commande " . $s['qty'] . " " . $s['desc'];
}
?>
jenny at jennys dot info
22-Feb-2004 03:12
22-Feb-2004 03:12
Here's a function which returns the array offset based on the array key. This is useful if you'd like to use array_slice to get all keys/values after key "foo".
<?
function array_offset($array, $offset_key) {
$offset = 0;
foreach($array as $key=>$val) {
if($key == $offset_key)
return $offset;
$offset++;
}
return -1;
}
$array = array('foo'=>'foo', 'bar'=>'bar', 'bash'=>'bash', 'quux'=>'quux');
print_r($array);
// Prints the following:
// Array
// (
// [foo] => foo
// [bar] => bar
// [bash] => bash
// [quux] => quux
// )
$offset = array_offset($array,'bar');
// $offset now contains '1'
$new = array_slice($array,$offset+1);
print_r($new);
// Prints the following:
// Array
// (
// [bash] => bash
// [quux] => quux
// )
?>
webmaster_nospam at wavesport dot com
13-Nov-2002 09:48
13-Nov-2002 09:48
This function may surprise you if you use arbitrary numeric values for keys, i.e.
<?php
//create an array
$ar = array('a'=>'apple', 'b'=>'banana', '42'=>'pear', 'd'=>'orange');
print_r($ar);
// print_r describes the array as:
// Array
// (
// [a] => apple
// [b] => banana
// [42] => pear
// [d] => orange
// )
//use array_slice() to extract the first three elements
$new_ar = array_slice($ar, 0, 3);
print_r($new_ar);
// print_r describes the new array as:
// Array
// (
// [a] => apple
// [b] => banana
// [0] => pear
// )
?>
The value 'pear' has had its key reassigned from '42' to '0'.
When $ar is initially created the string '42' is automatically type-converted by array() into an integer. array_slice() and array_splice() reassociate string keys from the passed array to their values in the returned array but numeric keys are reindexed starting with 0.
t dot oddy at ic dot ac dot uk
25-Apr-2002 10:47
25-Apr-2002 10:47
[Editor's Note:
It is easier to do the same thing using array_values()
]
array_slice() can be used to "re-index" an array to start from key 0. For example, unpack creates an array with keys starting from 1;
<?php
var_dump(unpack("C*","AB"));
?>
produces
<?php
array(2) {
[1]=>
int(65)
[2]=>
int(66)
}
?>
and
<?php
var_dump(array_slice(unpack("C*","AB"),0));
?>
give you
<?php
array(2) {
[0]=>
int(65)
[1]=>
int(66)
}
?>
developer at i-space dot org
04-Feb-2002 01:22
04-Feb-2002 01:22
remember that array_slice returns an array with the current element. you must use array_slice($array, $index+1) if you want to get the next elements.
richardgere at jippii dot fi
28-Jan-2002 02:14
28-Jan-2002 02:14
The same thing, written by a maladroit :)
<?php
function array_slice2( $array, $offset, $length = 0 )
{
if( $offset < 0 )
$offset = sizeof( $array ) + $offset;
$length = ( !$length ? sizeof( $array ) : ( $length < 0 ? sizeof( $array ) - $length : $length + $offset ) );
for( $i = $offset; $i < $length; $i++ )
$tmp[] = $array[$i];
return $tmp;
}
?>
dams at php dot net
16-Dec-2001 12:09
16-Dec-2001 12:09
Here is a version of Array_slice which takes into account keys.
That may be a suggestion for future developpement.
<?php
function array_slice_key($array, $offset){
if (!is_array($array))
return FALSE;
if (func_num_args() == 3){
$length = func_get_arg(2);
$length = max(0,intval($length));
} else {
$length = count($array);
}
$i = 0;
$return = array();
$keys = array_slice(array_keys($array), $offset, $length);
foreach( $keys as $key){
$return[$key] = $array[$key];
}
return $return;
}
?>