To diff between n-dimensional array, juste use this :
function array_diff_values($tab1, $tab2)
{
$result = array();
foreach($tab1 as $values) if(! in_array($values, $tab2)) $result[] = $values;
return $result;
}
array_diff_assoc
(PHP 4 >= 4.3.0, PHP 5)
array_diff_assoc — 追加された添字の確認を含めて配列の差を計算する
説明
array array_diff_assoc
( array $array1
, array $array2
[, array $...
] )
array1 を array2 と比較し、 その差を返します。array_diff() とは異なり、 配列のキーを用いて比較を行います。
パラメータ
- array1
-
比較元の配列。
- array2
-
比較する対象となる配列。
- ...
-
さらに比較する対象となる配列。
返り値
array1 の要素のうち、 その他の配列のいずれにも含まれないものだけを残した配列を返します。
例
例1 array_diff_assoc() の例
この例で、"a" => "green" の組が両方の配列に現れており、 このため、この関数の出力には含まれていません。 これとは異なり、0 => "red" は出力の中にありますが、 これは、二番目の引数において "red" が 1 というキーを有しているためです。
<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>
上の例の出力は以下となります。
Array ( [b] => brown [c] => blue [0] => red )
例2 array_diff_assoc() の例
key => value の組からの二つの値は、 (string) $elem1 === (string) $elem2 が成り立つ場合のみ等しいと見なされます。 言い替えると、厳密なチェックが行われるため、 文字列表現が同じである必要があります。
<?php
$array1 = array(0, 1, 2);
$array2 = array("00", "01", "2");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>
上の例の出力は以下となります。
Array ( [0] => 0 [1] => 1 )
注意
注意: この関数は、N 次元配列の一次元だけを調べます。もちろん、例えば array_diff_assoc($array1[0], $array2[0]); とすることにより、より深い次元でチェックを行うことも可能です。
array_diff_assoc
cedric at daneel dot net
21-May-2007 10:01
21-May-2007 10:01
contact at pascalopitz dot com
11-Apr-2007 08:14
11-Apr-2007 08:14
The direction of the arguments does actually make a difference:
<?
$a = array(
'x' => 'x',
'y' => 'y',
'z' => 'z',
't' => 't',
);
$b = array(
'x' => 'x',
'y' => 'y',
'z' => 'z',
't' => 't',
'g' => 'g',
);
print_r(array_diff_assoc($a, $b));
print_r(array_diff_assoc($b, $a));
?>
echoes:
Array
(
)
Array
(
[g] => g
)
chinello at gmail dot com
19-Mar-2007 03:33
19-Mar-2007 03:33
A small modification for array_diff_assoc_recursive from 'sc1n at yahoo dot com' , to not display any notices if a key don't exist and if error_reporting is set to E_ALL:
<?php
function array_diff_assoc_recursive($array1, $array2)
{
foreach($array1 as $key => $value)
{
if(is_array($value))
{
if(!isset($array2[$key]))
{
$difference[$key] = $value;
}
elseif(!is_array($array2[$key]))
{
$difference[$key] = $value;
}
else
{
$new_diff = array_diff_assoc_recursive($value, $array2[$key]);
if($new_diff != FALSE)
{
$difference[$key] = $new_diff;
}
}
}
elseif(!isset($array2[$key]) || $array2[$key] != $value)
{
$difference[$key] = $value;
}
}
return !isset($difference) ? 0 : $difference;
}
?>
Alexander Podgorny
31-May-2006 06:30
31-May-2006 06:30
NOTE: the diff_array also removes all the duplicate values that match to the values in the second array:
<?
$array1 = array("a","b","c","a","a");
$array2 = array("a");
$diff = array_diff($array1,$array2);
// yields: array("b","c") the duplicate "a" values are removed
?>
benjamin at moonfactory dot co dot jp
12-Jan-2005 02:56
12-Jan-2005 02:56
Hi all,
For php versions < 4.3...
<?php
/**
* array_diff_assoc for version < 4.3
**/
if (!function_exists('array_diff_assoc'))
{
function array_diff_assoc($a1, $a2)
{
foreach($a1 as $key => $value)
{
if(isset($a2[$key]))
{
if((string) $value !== (string) $a2[$key])
{
$r[$key] = $value;
}
}else
{
$r[$key] = $value;
}
}
return $r ;
}
}
Hope there's no bug,
cheers
?>
aidan at php dot net
09-Jun-2004 10:34
09-Jun-2004 10:34
This functionality is now implemented in the PEAR package PHP_Compat.
More information about using this function without upgrading your version of PHP can be found on the below link:
http://pear.php.net/package/PHP_Compat
Michael Johnson
26-Oct-2003 04:20
26-Oct-2003 04:20
[jochem at iamjochem dawt com]
Here is a slightly enhanced version of Micheal Johnsons function.
This version accepts arguments in the same way as
array_diff_assoc (i.e. you can pass as many arrays as you want - any
arguments that are not arrays are ignored). If the first argument is not an array you automatically get empty array back:
The point of the function is to return all values in the first array
whose keys (only keys are checked!) are not present in any subsequently passed arrays.
[original post]
array_diff_assoc() requires that both the key and the value pairs match. To match based on keys only, try this function.
<?php
function array_diff_keys()
{
$args = func_get_args();
$res = $args[0];
if(!is_array($res)) {
return array();
}
for($i=1;$i<count($args);$i++) {
if(!is_array($args[$i])) {
continue;
}
foreach ($args[$i] as $key => $data) {
unset($res[$key]);
}
}
return $res;
}
// Example
$a = array('a' => '1', 'b' => '2', 'c' => '3');
$b = array('a' => '2', 'b' => '2', 'e' => '4');
// Yields array('a' => '1', 'c' => '3')
// Note that the 'a' index is not removed (as one might expect)
$c = array_diff_assoc($a, $b);
// Yields array('c' => '3')
$d = array_diff_keys($a, $b);
?>
sc1n at yahoo dot com
12-Jul-2003 04:10
12-Jul-2003 04:10
[anders dot carlsson at mds dot mdh dot se]
The user contributed array_diff_assoc_recursive function is good except for the original array_diff_assoc always (?) returns an array.
Therefore I propose that $difference is initially set to an empty array (and the array is always returned), and the comparison against FALSE is replaced by count($new_diff). At least that's the modifications I made to run it they way my code expects.
[original post]
The following will recursively do an array_diff_assoc, which will calculate differences on a multi-dimensional level. (Forgive me if the braces do not line up, the note script did not like my tabs, and gave me trouble on some spaces.)
<?php
function array_diff_assoc_recursive($array1, $array2)
{
foreach($array1 as $key => $value)
{
if(is_array($value))
{
if(!is_array($array2[$key]))
{
$difference[$key] = $value;
}
else
{
$new_diff = array_diff_assoc_recursive($value, $array2[$key]);
if($new_diff != FALSE)
{
$difference[$key] = $new_diff;
}
}
}
elseif(!isset($array2[$key]) || $array2[$key] != $value)
{
$difference[$key] = $value;
}
}
return !isset($difference) ? 0 : $difference;
}
?>
carl at thep dot lu dot se
09-May-2003 06:55
09-May-2003 06:55
To unset elements in an array if you know the keys but not the values, you can do:
<?php
$a = array("foo", "bar", "baz", "quux");
$b = array(1, 3); // Elements to get rid of
foreach($b as $e)
unset($a[$e]);
?>
Of course this makes most sense if $b has many elements or is dynamically generated.