How to use array_unique() function in PHP – PHP Core Basics

• The array_unique() function removes the duplicate values (key-value) from an array. Let say if an array has two or more same values then array_unique() function keeps the first value while others will be removed.
• The array_unique() function takes an array as input parameter and returns a new array with unique values (removes duplicate values).
• The array_unique() function needs a parameter of type Array. This is required parameter not optional.
• The array_unique() function does’t work for multi-dimensional arrays.
• The array_unique() function is used to maintain uniqueness within the array or to avoid the duplicity of values in an array.

Syntax: 

array_unique(array)

For Example-
<?php
$a=array("a"=>"India","b"=>"USA","c"=>"India");
print_r(array_unique($a));
?>
Output:
Array ( [a] => India [b] => USA )