(PHP 4 >= 4.0.1, PHP 5)
array_diff — Computes the difference of arrays
$array1
, array $array2
[, array $...
] )
Compares array1
against array2
and
returns the difference.
array1
The array to compare from
array2
An array to compare against
...
More arrays to compare against
Returns an array containing all the entries from
array1
that are not present in any of the other arrays.
Example #1 array_diff() example
<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);
print_r($result);
?>
Multiple occurrences in $array1 are all treated the same way. This will output :
Array ( [1] => blue )
Note:
Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is the same.
Note:
This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff($array1[0], $array2[0]);.