- array_combine: documentation ( source)
- array_intersect: documentation ( source)
- print_r: documentation ( source)
- range: documentation ( source)
<?php
$a = array_combine(range(1, 10), range(1, 10));
$b = [5,6,1,2,4,7];
print_r($a);
print_r(array_intersect($a, $b));