Question

i) 正在尝试这一法典,但我发现这一错误:

Only variables can be passed by reference in xxx

说明

class page {
  function insert($db, $of, $form, &$arr) {

      $i = 0;

      foreach(array_combine($form[ value0 ], $arr) as $val=>$v){

          $sql->prepare("mysqli query here");
          $sql->bind_param( ssss , $val, $of, $v[$i][0], $v[$i][1]);//error here
          $sql->execute();
          $i++;

      }
      return true;
  }
}

原因是什么,如何解决? 感谢

Answer 1

I assume you re using mysqli::bind_param. All arguments except the first are passed by reference. This means they must be variables, and not strings, array elements, etc. I m actually not sure why it needs to do this by reference, but never mind. You can fix it pretty easily:

$v0 = $v[$i][0];
$v1 = $v[$i][1];
$sql->bind_param( ssss , $val, $of, $v0, $v1);

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