Online PHP editor | refs for qmaMi

<?php $_POST['checkbox_1'] = ''; $_POST['checkbox_11'] = 'ssa'; $_POST['checkbox_12'] = 'ssa'; $_POST['checkbox_30'] = ''; //$_POST['checkbox_13']; foreach($_POST as $key=>$val){ if(substr($key, 0, 9 ) != 'checkbox_') continue; if($val){ echo (int)substr($key, 9 )." "; } }