PHP Foreach（）无效参数

Question

I'm receiving the fooling error below but not sure why. the $_Post all have data.

error: Warning: Invalid argument supplied for foreach() in /home/soc/process_member.php on line 19

    $valid = true; 
    foreach($_POST['add'] && $_POST['cpl'] as $value) { 
        if(!isset($value)) { 
            $valid = false;
        } 
    }
    if(!$valid) { 
        $err .= 'please fill in all fields';
        $en['reg_error'] = '<div class=err style="color: #FF0000;"><b>'._error.': '.$err.'</b></div><br>';
        load_template('modules/members/templates/s_reg.tpl');   
    }

Answer 1

I think what you want is a merged array:

foreach(array_merge($_POST['add'], $_POST['cpl']) as $value) {
  // ...