How to remove duplicates from an array in php

The way PHP removes duplicates from an array is to use the array_unique() function, such as [array_unique(array)]. The array_unique function is a function specifically used to remove duplicate values ​​from an array.

The operating environment of this article: windows10 system, php 7.3, thinkpad t480 computer.

In PHP we can use the array_unique function to remove duplicate items in the array. Let’s introduce this function first.

array_unique() function is used to remove duplicate values ​​in an array. If two or more array values ​​are the same, only the first value is retained and the other values ​​are removed.

Note: The retained array will retain the key type of the first array item.

Grammar:

array_unique(array)

A small example:

<?php
$a=array("a"=>"red","b"=>"green","c"=>"red");
print_r(array_unique($a));
?>

Running results:

Array ( [a] => red [b] => green )

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