array_diff_assoc
(PHP 4 >= 4.3.0)
array_diff_assoc -- Computes the difference of arrays with
additional index check
Description
array array_diff_assoc ( array array1, array array2 [, array
...])
array_diff_assoc() returns an array containing all the values
from array1 that are not present in any of the other arguments.
Note that the keys are used in the comparison unlike array_diff().
Example 1. array_diff_assoc() example
<?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 result is:
Array
(
[b] => brown
[c] => blue
[0] => red
)
In our example above 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.
Two values from key => value pairs are considered equal
only if (string) $elem1 === (string) $elem2 . In other words
a strict check takes place so the string representations
must be the same.
Note: Please note that this function only checks one dimension
of a n-dimensional array. Of course you can check deeper
dimensions by using, for example, array_diff_assoc($array1[0],
$array2[0]);.
See also array_diff(), array_intersect(), and array_intersect_assoc().
