动态写入变量时在代码中发出问题

Question

我写了下面几行代码

          $advsr_firstname="David"
          $advsr_middlename ="";
         // note that these two are passed through function parametre



             $first_name=array('$or' => array(array("student.first_name" => new MongoRegex("/$advsr_firstname/i"))));
          $last_name= array('$or' => array(array("student.last_name" => new MongoRegex("/$advsr_middlename/i"))));

          $keyarguments = array(
                'first_name=>advsr_firstname',
                'last_name=>advsr_middlename'
                );

              $empty = "X9w+";

              foreach ($keyarguments as $key => $value)
               {

                if(${$value} =='' || ${$value} =='0' || ${$value} =="Select")
                {
                   ${$key} = array('$or' => array(array("dummy_feild" => new MongoRegex("/$empty/i"))));
                }
              }      

            $orrollno= array('$or' => array(array("student.roll_no" => new MongoRegex("/$arg/i"))));    

            $query = array( '$or' => array($first_name,$last_name,$orrollno));

我正在尝试动态编写查询，以便 $query 能够正常工作。

我希望如果“$advsr_middlename”为空，则代码应动态修改循环中的表达式 $last_name，如

    $last_name = array('$or' => array(array("dummy_feild" => new MongoRegex("/$empty/i"))));

它正在抛出错误消息未定义的变量first_name=>advsr_firstname ....

请帮助我，因为代码不起作用！！！

Answer 1

我认为这可能是解决方案：从

修复 $keyarguments 数组的语法

      $keyarguments = array(
            'first_name=>advsr_firstname',
            'last_name=>advsr_middlename'
            );

到

$keyarguments = [
    'first_name' => 'advsr_firstname',
    'last_name' => 'advsr_middlename',
];

动态写入变量时在代码中发出问题

Issue in the code while writting variables dynamically

php

arrays

php-5.6

php-7.1