How to remove identical elements in php

In PHP, you can use the array_unique() function to delete duplicate elements, the syntax is "array_unique($arr)". The array_unique() function is used to remove duplicate values ​​from an array. If two or more array values ​​are the same, only the first value is retained and the other values ​​are removed.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

array_unique($arr)

//删除重复元素
$arr = [1,2,3,0,1];
echo &#39;<pre class="brush:php;toolbar:false">&#39;;
var_dump($arr);
$arr = array_unique($arr);
//输出[1,2,3,0]
var_dump($arr);

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