


A brief discussion of PHP source code twenty-three: About the urlencode function
This article mainly introduces the twenty-three about the PHP source code: About the urlencode function, it has certain reference value. Now I share it with you. Friends in need can refer to it.
The PHP source code is briefly discussed. Twenty-three: Regarding the urlencode function
I haven’t read the source code of PHP for a while. Recently I have been reading the books I bought before. Some of the books have been read once, but a year later there are different things. Feeling
The urlencode function is often encountered during the development process. It acts on string encoding and uses it for the request part of the URL.
The urlencode function is used to encode the URL string
string urlencode (string str)
Returns a string. All non-alphanumeric characters in this string except -_. will be replaced with a percent sign (%) followed by two hexadecimal digits, and spaces will be Encoded as a plus sign ( ). This encoding is the same as the encoding of WWW form POST data, and the same encoding as the application/x-www-form-urlencoded media type. For historical reasons, this encoding differs from the RFC1738 encoding (see rawurlencode()) in encoding spaces as plus signs ( ).
In line 493 of the standard/url.c file, you can see the implementation of this function
out_str = php_url_encode(in_str, in_str_len, &out_str_len);RETURN_STRINGL(out_str, out_str_len, 0);
When looking at the php_url_encode function, I struggled for a long time because it has a #ifndef CHARSET_EBCDIC compilation Judgment, I have always regarded #ifndef as #ifdef, which makes it weird to understand
php_url_encode function is a process of traversing the entire string and replacing each character,
For except - All non-alphanumeric characters except _. will be replaced with a percent sign (%) followed by two hexadecimal digits,
There is processing for EBCDIC encoding at compile time
Spaces are encoded as plus signs ( ) (
if (c == ' ') {
*to = ' ';
}
The above is the entire content of this article, I hope it will be helpful to everyone Learning will be helpful. For more related content, please pay attention to the PHP Chinese website!
Related recommendations:
A brief discussion of PHP source code 21: About the array_slice function
A brief discussion on PHP source code twenty-two: About the array_splice function
The above is the detailed content of A brief discussion of PHP source code twenty-three: About the urlencode function. 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

Alipay PHP...

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,

Session hijacking can be achieved through the following steps: 1. Obtain the session ID, 2. Use the session ID, 3. Keep the session active. The methods to prevent session hijacking in PHP include: 1. Use the session_regenerate_id() function to regenerate the session ID, 2. Store session data through the database, 3. Ensure that all session data is transmitted through HTTPS.

How to debug CLI mode in PHPStorm? When developing with PHPStorm, sometimes we need to debug PHP in command line interface (CLI) mode...

The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.

How to automatically set the permissions of unixsocket after the system restarts. Every time the system restarts, we need to execute the following command to modify the permissions of unixsocket: sudo...

Sending JSON data using PHP's cURL library In PHP development, it is often necessary to interact with external APIs. One of the common ways is to use cURL library to send POST�...

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.
