php web request security processing
1. The difference between urlencode and rawurlencode
<?php test('https://tieba.baidu.com/f?kw=2&fr=wwwt'); test(':/?= &#'); test('测试'); function test($s) { echo "<b>urlencode('$s')</b> = [<b>"; var_dump(urlencode($s)); echo "</b>]<br/>"; echo "<b>rawurlencode('$s')</b> = [<b>"; var_dump(rawurlencode($s)); echo "</b>]<br/>"; } //运行结果 urlencode('https://tieba.baidu.com/f?kw=2&fr=wwwt') = [ D:\software\wamp\www\linux\webApi\test.php:9:string 'https%3A%2F%2Ftieba.baidu.com%2Ff%3Fkw%3D2%26fr%3Dwwwt' (length=54) ] rawurlencode('https://tieba.baidu.com/f?kw=2&fr=wwwt') = [ D:\software\wamp\www\linux\webApi\test.php:12:string 'https%3A%2F%2Ftieba.baidu.com%2Ff%3Fkw%3D2%26fr%3Dwwwt' (length=54) ] urlencode(':/?= &#') = [ D:\software\wamp\www\linux\webApi\test.php:9:string '%3A%2F%3F%3D+%26%23' (length=19) ] rawurlencode(':/?= &#') = [ D:\software\wamp\www\linux\webApi\test.php:12:string '%3A%2F%3F%3D%20%26%23' (length=21) ] urlencode('测试') = [ D:\software\wamp\www\linux\webApi\test.php:9:string '%E6%B5%8B%E8%AF%95' (length=18) ] rawurlencode('测试') = [ D:\software\wamp\www\linux\webApi\test.php:12:string '%E6%B5%8B%E8%AF%95' (length=18) ]
As can be seen from the above execution results, the results of the two methods urlencode and rawurlencode are the same when processing letters, numbers, special symbols, and Chinese. , the only difference is the processing of spaces, urlencode is processed as " ", rawurlencode is processed as " "
2. Function strip_tags: remove HTML and PHP tags
Note: This function can remove any HTML and PHP tag strings contained in the string. If the HTML and PHP tags of the string are originally wrong, for example, the greater than symbol is missing, an error will also be returned. This function has the same function as fgetss(). fgetss reads the file from the file and removes the html and php tags.
<?php echo strip_tags("Hello <b>world!</b>");
Run results
Hello world!
3. Function htmlspecialchars, convert special characters into HTML format
htmlspecialchars() function converts predefined characters Convert to HTML entities.
The predefined characters are:
& (ampersand) becomes &
" (double quotation mark) becomes "
' (single quotation mark) becomes '
< (less than) becomes <
> (greater than) becomes>
##
<?php echo htmlspecialchars("This is some <b>bold</b> text.&");
This is some <b>bold</b> text.&
<?php echo htmlentities("<? W3S?h????>");
<? W3S?h????>
Single quotation mark (')
Double quotation mark (")
Backslash (\)
NULL
<?php echo addslashes('Shanghai is the "biggest" city in China.');
Shanghai is the \"biggest\" city in China.
<?php echo stripslashes("Who\'s Bill Gates?");
Who's Bill Gates?
PHP source code php -beast encryption
PHP implementation of sending emails using QQ mailbox
The above is the detailed content of php web request security processing. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
