Php mysql\u real\u escape\u字符串在其他服务器上不起作用

我试图在代码中使用mysql\u real\u escape\u字符串。它在本地主机上运行良好。然而，它在其他服务器上显示错误。我怎样才能找到解决方案呢？有人能给我解决方案吗？我的代码出了什么问题

<?php
$username = "abcdb";
$password = "Abc@2014";
$hostname = "abcdb.db.9135182.hostedresource.com"; 
$db = "abcdb";
 $dbhandle = mysql_connect($hostname, $username, $password) or die("Unable to connect to MySQL");
mysql_select_db($db,$dbhandle) or die('cannot select db');
//connection to the database
$name="";
$email="";
$batch="";
$mobile="";

    if (isset($_POST['submit'])) {
    $error = "";


    if (!empty($_POST['name'])) {
   $name = mysql_real_escape_string($_POST['name']);
    } else {
    $error .= "You didn't type in your name. <br />";
    }

    if (!empty($_POST['email'])) {
    $email =mysql_real_escape_string($_POST['email']);
      if (!preg_match("/^[_a-z0-9]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $email)){ 
      $error .= "The e-mail address you entered is not valid. <br/>";
      }
    } else {
    $error .= "You didn't type in an e-mail address. <br />";
    }
if (!empty($_POST['batch'])) {
     $batch =mysql_real_escape_string($_POST['batch']);

if (!preg_match('/^[0-9]{4}$/', $batch))  { 
      $error .= "Enter a valid batch. <br/>";
      }
    }
    else {
    $error .= "You didn't type batch. <br />";
    }
     if(($_POST['code']) == $_SESSION['code']) { 
    $code = $_POST['code'];
    } else { 
    $error .= "The captcha code you entered does not match. Please try again. <br />";    
    }



    if (!empty($_POST['mobile'])) {
     $mobile =mysql_real_escape_string($_POST['mobile']);

    if (!preg_match('/^[0-9]{10}$/', $mobile)) { 
      $error .= "Enter a valid Mobile number. <br/>";
      }

    }else {
    $error .= "You didn't type your Mobile Number. <br />";
    }

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研究如何使用预先准备好的语句，例如mysqli-。mysql\u real\u escape\u字符串已弃用。您的服务器和本地主机mysql版本可能不同

看

另外，您刚刚发布的错误消息为您提供了线索。在调用mysql\u real\u escape\u string之前，测试您传递的参数是否为字符串

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请参见

哪个错误是错误？您的服务器是否接受不推荐的mysql_*命令，或者可能已安装mysqli_*或PDO命令？请发布错误！mysql库已弃用，请确保您的服务器仍然支持它，或者您可以使用mysqli/PDOI get错误警告：mysql\u real\u escape\u string期望参数1为string，资源在C:\wamp\www\test\contact1.php第323行提供