array_diff_assoc
(PHP 4 >= 4.3.0, PHP 5)
array_diff_assoc -- Computes the difference of arrays with additional index check
Description
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 1. 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 2. 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
) |
|
Notes
Note:
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]);.