PHP输出现阶段进程所有变量 / 常量 / 模块 / 函数 / 类
PHP输出当前进程所有变量 / 常量 / 模块 / 函数 / 类
1.?get_defined_vars??(PHP 4 >= 4.0.4, PHP 5)?― 获取由所有已定义变量所组成的数组
?
array?get_defined_vars?(?void?)
?
此函数返回一个包含所有已定义变量列表的多维数组,这些变量包括环境变量、服务器变量和用户定义的变量。
?
<?php echo '<pre class="brush:php;toolbar:false">'; $b = array(1,1,2,3,5,8); $arr = get_defined_vars(); // 打印 $b print_r($arr["b"]); // 打印所有服务器变量 print_r($arr["_SERVER"]); // 打印变量数组的所有可用键值 print_r(array_keys(get_defined_vars())); ?>
2.?get_defined_functions?(PHP 4 >= 4.0.4, PHP 5)?―?获取所有已经定义的函数
?
array get_defined_functions ( void ) //void 表示为空,不需要任何参数
?
<?php echo '<pre class="brush:php;toolbar:false">'; function foo() { echo "This is my function foo"; } $arr = get_defined_functions(); print_r($arr); ?>
?
3.?get_loaded_extensions?(PHP 4, PHP 5)?―?获取所有可用的模块
?
<?php echo '<pre class="brush:php;toolbar:false">'; print_r(get_loaded_extensions()); ?>
4.?get_extension_funcs?(PHP 4, PHP 5)?―?获取指定模块的可用函数
?
array?get_extension_funcs?(?string?$module_name
?)?该函数返回指定模块所有可用的函数。传入的参数(模块名称)必须是小写
?
<?php echo '<pre class="brush:php;toolbar:false">'; print_r(get_extension_funcs("gd")); print_r(get_extension_funcs("xml")); ?>
5.?get_defined_constants?(PHP 4 >= 4.1.0, PHP 5)?―? 获取关联数组的名字所有的常量和他们的价值
?
array?get_defined_constants?([?bool?$categorize
?= false?] )
?
<?php echo '<pre class="brush:php;toolbar:false">'; define("MY_CONSTANT", 1); print_r(get_defined_constants(true)); ?>
6.?get_declared_classes?(PHP 4, PHP 5)?―??获取由已定义类的名字所组成的数组
?
array?get_declared_classes?(?void?)
?
<?php echo '<pre class="brush:php;toolbar:false">'; //define classone class classone { } //define classtwo class classtwo { } //This will show X classes (built-ins, extensions etc) with //classone and classtwo as the last two elements print_r(get_declared_classes()); //define classthree class classthree { } //...and four class classfour { } //Shows the same result as before with class three and four appended print_r(get_declared_classes()); ?>
?
?
?

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.
