Drupal中的HTTP错误500（内部服务器错误）

Question

Iam使用php为使用php的ios应用程序提供使用json的数据。但在浏览器中运行代码时，它显示服务器错误。如果数据库中没有值，则显示代码中提供的{"posts":null}。但是，如果数据库中存在值，则会出现问题。它显示错误

Server error The website encountered an error while retrieving http://path to the server file/php/categoryitemlisting.php?category=11. It may be down for maintenance or configured incorrectly. Here are some suggestions: Reload this webpage later. HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request. 此错误只发生在这个php文件中。使用其他文件，我可以传输数据。

我connection.php文件：

<?php 
$link = mysql_connect("127.0.0.1","root","") or die('Cannot connect to the DB'); 
mysql_set_charset("utf8"); 
mysql_select_db('cotton',$link) or die('Cannot select the DB'); 
?> 

Categoryitemlisting.php

<?php 

    require('connection.php'); 
    $item = array()  ; 

    /* connect to the db */ 
     if(isset($_REQUEST['category'])) 
     { 
      $k=$_REQUEST['category']; 
     /* grab the posts from the db */ 
      // $k=11; 
      $catid = mysql_query("SELECT entity_id FROM field_data_field_cat WHERE field_cat_tid= $k"); 
      while($r = mysql_fetch_assoc($catid)) 
      { 

       $category[] = $r['entity_id']; 
       foreach ($category as $cat); 
       { 

       $data= mysql_query("SELECT field_data_field_name.entity_id, field_data_field_name.field_name_value, file_managed.uri, field_data_field_sec.field_sec_tid FROM file_managed INNER JOIN (field_data_field_thumb, field_data_field_name, field_data_field_sec) ON (file_managed.fid = field_data_field_thumb.field_thumb_fid AND field_data_field_name.entity_id = field_data_field_thumb.entity_id AND field_data_field_thumb.entity_id = field_data_field_sec.entity_id) WHERE field_data_field_name.entity_id = $cat"); 

       $items = mysql_fetch_assoc($data); 
       $item[]= $items; 
       } 
      } 
       $re="public:\/\/"; 
       $list = json_encode(array('posts'=>$item)); 
      $list = str_replace($re, "http://localhost/sites/default/files/" ,$list); 
       echo $list; 

      @mysql_close($link); 

     } 

     else 
     { 
     echo "connection failed"; 
     } 
?> 

我如何通过修复此错误的获取值？我不认为这是服务器的问题。如果代码中有任何其他错误？

Answer 1

最后指出问题....

有一个在服务器代码$k=$_REQUEST[' category'];的空间。这导致了错误。

Answer 2

查找到YOUT php.ini并设置：

display_errors = on
error_reporting = E_ALL

如果display_error是关闭的，你有你的代码中的任何类型的问题（如：分析错误）你的反应将是一个500状态页面。