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PHP Functions Online


array_diff

(PHP 4 >= 4.0.1, PHP 5)

array_diffComputes the difference of arrays

array array_diff(array $array1 , array $array2[, array $...])

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Preview #

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Description #

array array_diff ( array $array1 , array $array2 [, array $... ] )

Compares array1 against array2 and returns the difference.

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 entries from array1 that are not present in any of the other arrays.

Examples #

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
)

Notes #

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]);.

See Also #