- var_dump: documentation ( source)
- array_intersect: documentation ( source)
- array_unique: documentation ( source)
<?php
declare(strict_types=1);
$arr1 = ['test', 'test', 'foo'];
$arr2 = ['test1', 'test', 'bar'];
\var_dump(array_intersect(\array_unique($arr1), \array_unique($arr2)));