array_diff
(PHP 4 >= 4.0.1, PHP 5)
array_diff — Computes the difference of arrays
Description
$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
- array_diff_assoc() - Computes the difference of arrays with additional index check
- array_intersect() - Computes the intersection of arrays
- array_intersect_assoc() - Computes the intersection of arrays with additional index check
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