Online PHP editor | refs for SgodV

<?php $arr1 = array('green', 'blue', 'cyan1'); // blue cyan1 green $arr2 = array('yellow', 'red', 'cyan2'); // cyan2 red yellow $i = 1; function print_elements($e1, $e2) { global $i; $r = substr($e1, 0, 4) <=> substr($e2, 0, 4); echo "$i. $e1 <=> $e2 == $r\n"; $i++; return $r; } print_r(array_uintersect($arr1, $arr2, 'print_elements'));