Check and Remove Duplicate Values from PHP Array

Jun 17th, 2007

I want to check whether my array holds duplicate entry and if it holds duplicate values then remove those duplicate value.

This code will directly remove the duplicate value from an Array.
1. Remove duplicate values from an array

<?php
$arrUnique = array_unique ($array1);
?>

This array_unique function work in this manner-
(String)element1 = (string)element2;
String representation of each value will be checked.

2. Check whether an array holds duplicate values

<?php
if (count(array_unique($arr3)) < count($arr3))
    echo 'Duplicate entry in array';
else
    echo 'No Duplicate values in array';
?>

So, after combining both codes, I can check and be assured that I have unique values in my array.

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Mahesh Dada

hi thank you i get proper array but how i also change the key of my array
ex. $arr=array(0=>2, 1=>2, 2=>4, 3=>4);
$arr=array_unique($arr);

o/p:
array(0=>2, 3=>4);

here i want
array(0=>2, 1=>4);
Mahesh Dada

hi thank you i get proper array but how i also change the key of my array ex. $arr=array(0=>2, 1=>2, 2=>4, 3=>4); $arr=array_unique($arr); o/p: array(0=>2, 3=>4);here i want array(0=>2, 1=>4);
satyakaran

Try with print_r(array_values(array_unique($arr)));
satyakaran

Try with print_r(array_values(array_unique($arr)));
rupesh

hi satya prakashIt was nice to read ur code for checking duplicate values in array.Thanksrupesh PHP developerGurgaon, India
rupesh

hi satya prakash
It was nice to read ur code for checking duplicate values in array.

Thanks
rupesh
PHP developer
Gurgaon, India
http://www.satya-weblog.com/2007/06/php-array-common-functions.html Web Scripting » PHP array – Common Usage

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