JQUERY&php发布错误500(服务器内部错误)

Question

我在开发的webapp中遇到错误,我确信这是一个非常基本的错误.

每当我在网上运行此代码时,chrome debbuger都会返回此错误:

 POST http://my_ip/server_wrapper.php 500 (Internal Server Error) 

1. PHP服务器正常工作,phpinfo()正确返回整个信息
2. Web服务器是Apache.
3. Iptables完全打开,我只是在局域网下使用它.
4. Web根目录中所有文件的权限是755.

这是JQUERY,js文件片段"

this.post    = function () {
 $.post ("server_wrapper.php",
  {
   _id:          this.id,
   _question:    this.question,
   _type:        "none"
  },
  function (data, status) {
   alert ("DATA: " + data + " status: " + status);
  }
 );
}

这是php文件:

<?php

if (isset($_POST["_question"]) && isset($_POST["_type"]) && isset($_POST["_id"])) {

$question = $_POST["_question"];
$type     = $_POST["_type"];
$id       = $_POST["_id"];

$con      = mysqli_connect ("localhost", "user", "pass", "database");

if (mysqli_connect_errno($con)) {
    echo "Failed to connecto to db";

} else {
    mysqli_query ($con, "INSERT INTO questions (id, question, type) VALUES ('$id','$question','$type')");
}

mysqli_close ($con);
 }
?>

编辑

这就是日志一遍又一遍地返回:

PHP Fatal error:  Call to undefined function mysqli_connect() in /var/www/server_wrapper.php

Answer 1

要在页面上显示错误:

<?php
    ini_set('display_errors', '1');
    ini_set('error_reporting', E_ALL);
?>

首先将启用页面本身的错误显示,而不是生成500错误.

第二个将确保报告所有错误.这包括通知.

建议:编写甚至不会发出通知的代码.

要查找PHP错误日志文件:

grep error_log /etc/php.ini
grep ^error_log /etc/php.ini

要在RedHat系列服务器上安装MySQL:

yum install mysql.x86_64
yum install mysql mysql-server
chkconfig --level 2345 mysqld on
service mysqld start
mysqladmin -u root password somepassword

如果您想访问最新的PHP版本,我建议您使用以下repos.

wget http://mirrors.coreix.net/fedora-epel/6/x86_64/epel-release-6-7.noarch.rpm
wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm

安装:

rpm -Uvh remi-release-*.rpm epel-release-*.rpm
/bin/rm epel-release-*.noarch.rpm remi-release-*.rpm
perl -pi -e 's/enabled=0/enabled=1/g' /etc/yum.repos.d/remi.repo
yum update (optional - not recommended unless you know what you are doing)
yum install yum-plugin-priorities

确保在安装repos之后编辑它们并将enabled设置为0,这样您就可以选择性地使用它们.

yum --enablerepo=remi,epel install whatever

Answer 2

看起来没有安装或启用mysqli扩展.检查你的php.ini以获取该行extension=mysqli.so,否则启用它或安装它sudo apt-get install php5-mysql