PHP array_unique() Function
Example
Remove duplicate values from an array:
<?php
$a=array("a"=>"red","b"=>"green","c"=>"red");
print_r(array_unique($a));
?>
Run example »
Definition and Usage
The array_unique() function removes duplicate values from an array. If two or more array values are the same, the first appearance will be kept and the other will be removed.
Note: The returned array will keep the first array item's key type.
Syntax
array_unique(array)
| Parameter | Description |
|---|---|
| array | Required. Specifying an array |
| sortingtype | Optional. Specifies how to compare the array elements/items. Possible values:
|
Technical Details
| Return Value: | Returns the filtered array |
|---|---|
| PHP Version: | 4.0.1+ |
| Changelog: | The default value of sortingtype was changed back to SORT_STRING in PHP 5.2.10. The default value of sortingtype was changed to SORT_REGULAR in PHP 5.2.9. Prior to this version, the default value was SORT_STRING. |
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