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array_unique — Removes duplicate values from an array.


array array_unique(array);
array array: Array from which to remove duplicate elements


Original array with duplicate elements removed; FALSE on error


This function simply removes duplicate elements from array and returns the resulting array. Key/value relationships are preserved in the resulting array.

All elements of array that are themselves arrays are considered identical, and only the first exists in the returned array. Similarly, all elements of array that are objects are considered identical, and only the first of them exists in the returned array.


PHP 4 since 4.0.1


Example 35. Remove duplicate values from an array

class foo {
    var $foo = 7;

class bar {
    var $bar = 8;

$foo = new foo;
$bar = new bar;

$array = array(array(1), 1, $bar, $foo, 2, 3.3, 2, array(3, 4), array('bob' => 4));
echo "The array with duplicates removed is:\n";

The array with duplicates removed is:
    [0] => Array
            [0] => 1

    [1] => 1
    [2] => bar Object
            [bar] => 8

    [4] => 2
    [5] => 3.3

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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