Detailed explanation of PHP standard specifications
This article mainly shares with you the detailed explanation of PHP standard specifications, hoping to help everyone.
psr0: Automatic loading standard
has been replaced by psr4, you can learn about
1. Mandatory: Fully qualified namespace and class format: \
2. Mandatory: Each namespace must have a top-level namespace (Vendor Name).
3. Each namespace can contain any number of sub-namespaces.
4. When the file system loads the source file, the separator between namespaces will be converted to DIRECTORY_SEPARATOR.
5. Underscores _ in the class name
6. Fully qualified namespaces and classes will have the .php suffix added when loading source files from the file system.
7. Letter cases in a fully qualified namespace can be any combination.
Example
\Doctrine\Common\IsolatedClassLoader => /path/to/project/lib/vendor/Doctrine/Common/IsolatedClassLoader.php \Symfony\Core\Request => /path/to/project/lib/vendor/Symfony/Core/Request.php \Zend\Acl => /path/to/project/lib/vendor/Zend/Acl.php \Zend\Mail\Message => /path/to/project/lib/vendor/Zend/Mail/Message.php \namespace\package\Class_Name => /path/to/project/lib/vendor/namespace/package/Class/Name.php \namespace\package_name\Class_Name => /path/to/project/lib/vendor/namespace/package_name/Class/Name.php
psr1: Basic programming specifications
Mandatory: The php tag must be or 2. Mandatory: The file must be encoded in UTF-8 without BOM 3. The code in the php file can only be declarations such as defining classes, functions, constants, etc., or it can only be some side operations 4. Namespaces and classes must meet psr0 or psr45. Class The name must be StudlyCaps [CamelCase naming starting with a capital] Specification 6. All letters of constants in the class must be capitalized and separated by underscores 7. Method names must be camelCase naming specifications.
Explanation
副操作包含却不仅限于：生成输出、直接的 require 或 include、连接外部服务、
修改 ini 配置、抛出错误或异常、修改全局或静态变量、读或写文件等。<?php// side effect: change ini settingsini_set('error_reporting', E_ALL);// side effect: loads a fileinclude "file.php";// side effect: generates outputecho "<html>\n";// declarationfunction foo(){
// function body}<?php// declarationfunction foo(){
// function body}// conditional declaration is not a side effectif (! function_exists('bar')) { function bar()
{
// function body
}
}psr2 programming style specification
is an extension of psr1
1. Must follow psr12. Indentation must use 4 spaces Character 3. The number of characters per line should be softly kept within 80. In theory, it must not be more than 120, but there must be no hard limit. 4. A blank line must be inserted after each namespace declaration and use declaration block. All uses must be declared after namespace. 5. The opening braces of methods and classes must be written on a new line after their declaration. 6. abstract and final must be before the modifiers private, protected and public, and static must be declared after the access modifier. 7. There must be a space after the keyword of the control structure, but it must not be when calling a method or function. 8. The opening brace of a control structure must be written on the same line as the declaration. 9. There must be no spaces after the opening left bracket and before the closing right bracket of the control structure. 10. All PHP files must use Unix LF as the line terminator.
11. All PHP files must end with a blank line. 12. There must be no extra spaces after a non-blank line. 13. There must be no more than one statement per line. 14. All PHP keywords must be in lowercase.
Instance
<?phpnamespace Vendor\Package;use FooInterface;use BarClass as Bar;use OtherVendor\OtherPackage\BazClass;class Foo extends Bar implements FooInterface{
public function sampleMethod($a, $b = null)
{
if ($a === $b) {
bar();
} elseif ($a > $b) { $foo->bar($arg1);
} else {
BazClass::bar($arg2, $arg3);
}
} final public static function bar()
{
// method body
}
}psr4 automatic loading
\
Note: no longer after psr4 It's called a fully qualified namespace, but a fully qualified class name. 1. A fully qualified class name must have a top-level namespace, called a "vendor namespace" 2. A fully qualified class name can have one or more sub-namespaces 3. A complete class name must have a final class name; 4 . Underscores have no special meaning. 5. The complete class name can be composed of any uppercase and lowercase letters; 6. All class names must be case-sensitive. 7. In the complete class name, remove the first namespace separator, and the preceding one or more consecutive namespaces and sub-namespaces are used as the "namespace prefix", which must correspond to at least one "file base directory"; 8. The subnamespace immediately following the namespace prefix must match the corresponding "file base directory", and the namespace delimiter will be used as the directory delimiter. 9. The class name at the end must have the same name as the corresponding file with the .php suffix. 10. The implementation of the autoloader must not throw exceptions, must not trigger any level of error messages, and should not have a return value.
Instance
| Namespace prefix | File base directory | File path | |
|---|---|---|---|
| Acme\Log\Writer | ./acme -log-writer/lib/ | ./acme-log-writer/lib/File_Writer.php | ##\Aura\Web\Response\Status |
| /path/to/aura-web/src/ | /path/to/aura-web/src/Response/Status.php | \Symfony\Core\Request | |
| ./vendor/Symfony/Core/ | ./vendor/Symfony/Core/Request .php | ##\Zend\Acl | |
| /usr/includes/Zend/ | /usr/includes/Zend /Acl.php | Related recommendations: |
php standard generation verification code program
The above is the detailed content of Detailed explanation of PHP standard specifications. 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
AI Hentai Generator
Generate AI Hentai for free.
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
1382
52
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
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
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
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
7 PHP Functions I Regret I Didn't Know Before
Nov 13, 2024 am 09:42 AM
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
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
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
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
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,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
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
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
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 PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
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.
