php array_filter filters null values ​​​​in the array

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<?php
$arr = [&#39;&#39;,2,1,3,4,5];
$arr = array_filter($arr);
print_r($arr);

Output: Array ( [1] => 2 [2] => 1 [3] => 3 [4] => 4 [5] => 5 )

Usually used together with array_unique

##array_filter(array_unique($arr)); to remove empty values ​​and heavy values

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