How to remove identical elements from an array in php

How to remove identical elements from an array? It is written like this in the php manual
array_unique (PHP 4 >= 4.0.1)
array_unique -- remove duplicate values ​​​​in the array

Description
array array_unique (array array)


array_unique() accepts array as input and returns a new array without duplicate values.

Note that the key name remains unchanged. array_unique() sorts the values ​​first as strings, then retains only the first encountered key for each value, and then ignores all subsequent keys. This does not mean that the first occurrence of the same value in an unsorted array will be preserved.

Note: Two units are considered the same if and only if (string) $elem1 === (string) $elem2. That is, when the expressions of the strings are the same.

The first unit will be retained.

Example 1. array_unique() Example
[php]
$input = array ("a" => "green", "red", "b" => "green", "blue ", "red");
$result = array_unique ($input);
print_r($result);
?>