Question

尝试对网球锦标赛的注册表格进行一些稍微棘手的表单验证（在本例中为复选框）

<?php 
if ( ( isset($_POST['ms'])&&isset($_POST['ws']) )
        || (isset($_POST['mc'])&&isset($_POST['ws']))
        || (isset($_POST['md'])&&isset($_POST['ws']))
        || (isset($_POST['ms'])&&isset($_POST['wc']))
        || (isset($_POST['ms'])&&isset($_POST['wd']))
        || (isset($_POST['mc'])&&isset($_POST['wc']))
        || (isset($_POST['mc'])&&isset($_POST['wd']))
        || (isset($_POST['md'])&&isset($_POST['wd']))
    ){
      $error_message .=('You can only play as one sex! <br />');
  }


if ( (isset($_POST['mc'])&&isset($_POST['md']) ) { //***
  $error_message .=('You cannot play in both the cadet tournament and mens doubles <br />');
  }

但是，这会导致带有三个星号的行的解析错误。

意外的'{'

据推测，我做错了什么，不是使用花括号，而是使用圆括号......但是我看不到...

Answer 1

您在第二个if语句中缺少结束括号，请使用：

if ((isset($_POST['mc']) && isset($_POST['md'])))

将来我会建议在复杂的陈述中计算你的开始和结束括号，以确保它们是平衡的。

Answer 2

<?php 
if((isset($_POST['ms']) && isset($_POST['ws']))
        || (isset($_POST['mc'])&&isset($_POST['ws']))
        || (isset($_POST['md'])&&isset($_POST['ws']))
        || (isset($_POST['ms'])&&isset($_POST['wc']))
        || (isset($_POST['ms'])&&isset($_POST['wd']))
        || (isset($_POST['mc'])&&isset($_POST['wc']))
        || (isset($_POST['mc'])&&isset($_POST['wd']))
        || (isset($_POST['md'])&&isset($_POST['wd']))
    )){

      $error_message .=('You can only play as one sex! <br />');
  }


if((isset($_POST['mc']) && isset($_POST['md'])){ //***

    $error_message .=('You cannot play in both the cadet tournament and mens doubles <br />');
  }

Answer 3

必须删除第一个(，如果必须删除

if( isset($_POST['mc']) && isset($_POST['md']) ){ //***
    $error_message .=('You cannot play in both the cadet tournament and mens doubles <br />');
}

if语句中的括号解析错误

3 个答案: