Understand the automatic escaping of arrays stored in PHP

Recently, when I was using PHP to develop a website, I encountered a problem: when the data entered by the user was stored in an array, it was found that the special characters in the data were not escaped, which could easily lead to security vulnerabilities.

In order to solve this problem, we need to understand the automatic escaping mechanism of PHP.

The automatic escaping mechanism in php is implemented through the magic_quotes_gpc option. When this option is turned on, PHP will automatically escape some special characters, such as single quotes, double quotes, backslashes, etc., in user input and data obtained from the database. The purpose of this is to prevent security issues such as SQL injection, but it will also cause some incorrect escaping. For example, when storing rich text content, HTML tags and CSS styles will also be escaped, resulting in abnormal display.

In order to solve this problem, we can escape the data entered by the user ourselves by turning off the magic_quotes_gpc option. This can avoid escaping unnecessary content and protect the security of the data.

The following is a simple sample code that demonstrates how to manually escape and store it in an array:

//关闭magic_quotes_gpc选项
ini_set('magic_quotes_gpc', 'off');

//接收用户输入的数据
$username = addslashes($_POST['username']);
$password = addslashes($_POST['password']);

//存入数组
$user = array(
    'username' => $username,
    'password' => $password
);

In the above code, first use the ini_set function to turn off the magic_quotes_gpc option, and then use the addslashes function to input to the user Escape the data, and finally store the escaped data into the array.

In addition, we can also use the htmlspecialchars function to escape html tags to ensure that rich text content can be displayed correctly. The specific code is as follows:

//关闭magic_quotes_gpc选项
ini_set('magic_quotes_gpc', 'off');

//接收用户输入的数据
$content = $_POST['content'];

//转义html标签
$content = htmlspecialchars($content, ENT_QUOTES);

//存入数组
$data = array(
    'content' => $content
);

To summarize, the automatic escaping mechanism in PHP can be controlled by modifying the magic_quotes_gpc option. In addition, the data can also be escaped manually to ensure data security. In actual development, we should choose appropriate escaping methods based on specific application scenarios to avoid security vulnerabilities and display abnormalities.

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