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array_diff_assoc
Computes the difference of arrays with additional index check
(PHP 4 >= 4.3.0, PHP 5)
array array_diff_assoc ( array array1, array array2 [, array ...] )
Compares array1 against array2 and returns the difference. Unlike array_diff() the array keys are used in the comparision.
Parameters
- array1
The array to compare from
- array2
An array to compare against
- ...
More arrays to compare against
Return Values
Returns an array containing all the values from array1 that are not present in any of the other arrays.
Examples
Example 237. array_diff_assoc() example
In this example you see the "a" => "green"
pair is present in both arrays and thus it is not in the ouput from the
function. Unlike this, the pair 0 => "red"
is in the ouput because in the second argument "red"
has key which is 1.
<?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);
?>The above example will output:
Array
(
[b] => brown
[c] => blue
[0] => red
)
Example 238. array_diff_assoc() example
Two values from key => value pairs are
considered equal only if (string) $elem1 === (string)
$elem2 . In other words a strict check takes place so
the string representations must be the same.
<?php
$array1 = array(0, 1, 2);
$array2 = array("00", "01", "2");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>The above example will output:
Array
(
[0] => 0
[1] => 1
)