array_unique() function in PHP

The array_unique() function removes duplicate values from an array. It returns the filtered array with unique elements.

Syntax

array_unique(arr, compare)

Parameters

• arr − The specified array.

• compare − Specifies how to compare the array elements/items. Possible values

  • SORT_STRING − Compare items as strings

  • SORT_REGULAR − Compare items without changing types

  • SORT_NUMERIC − Compare items numerically

  • SORT_LOCALE_STRING − Compare items as strings, based on current local.

Return

The array_unique() function returns the filtered array.

Example

The following is an example −

<?php
$arr = array("a"=>"one","b"=>"two","c"=>"two", "d"=>"three", "e"=>"three");
print_r(array_unique($arr));
?>

Output

Array (
[a] => one
[b] => two
[d] => three
)