Online PHP editor | refs for u4FI1

<?php $needles = ['a','c','r','r']; $haystacks = ['carr','car','arc','ra','c','abc','do','aa','rr', 'rrr']; $result = []; foreach ($haystacks as $i => $haystack) { foreach ($needles as $needle) { $haystack = preg_replace("/$needle/", '', $haystack, 1); } if (!$haystack) { $result[] = $haystacks[$i]; } } var_export($result);