How to escape special characters in mysql in php

In PHP, you can use the mysqli_real_escape_string function to escape special characters in strings used in mysql. The syntax is "mysqli_real_escape_string(connection,escapestring);".

The operating environment of this tutorial: windows10 system, php5.6. This article is applicable to all brands of computers.

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PHP mysqli_real_escape_string() function

Definition and usage

mysqli_real_escape_string() function conversion Defines special characters in strings used in SQL statements.

Syntax

mysqli_real_escape_string(connection,escapestring);

Parameters

connection required. Specifies the MySQL connection to use.

escapestring Required. The string to escape. The encoded characters are NUL (ASCII 0), \n, \r, \, ', " and Control-Z.

Technical Details

Return Value: Returns the escaped string .

PHP Version: 5

Escape special characters in string:

<?php 
// 假定数据库用户名：root，密码：123456，数据库：RUNOOB 
$con=mysqli_connect("localhost","root","123456","RUNOOB"); 
if (mysqli_connect_errno($con)) 
{ 
    echo "连接 MySQL 失败: " . mysqli_connect_error(); 
} 

mysqli_query($con,"CREATE TABLE websites2 LIKE websites");

$newname="菜鸟&#39;教程";

// 没有转义 $newname 中特殊字符，执行失败
mysqli_query($con,"INSERT into websites2 (name) VALUES (&#39;$newname&#39;)");

// 转义特殊字符
$newpers=mysqli_real_escape_string($con,$newname);

// 转义后插入，执行成功
mysqli_query($con,"INSERT into websites2 (name) VALUES (&#39;$newpers&#39;)");

mysqli_close($con);
?>

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