php中如何调用用户自定义的函数(实例详解)
以下是对php中调用用户自定义函数的方法进行了详细的分析介绍,需要的朋友可以过来参考下
先放上来别人的例子吧:
call_user_func函数类似于一种特别的调用函数的方法,使用方法如下:
代码如下:
function a($b,$c) { echo $b; echo $c; } call_user_func('a', "111","222"); call_user_func('a', "333","444"); //显示 111 222 333 444 ?>
调用类内部的方法比较奇怪,居然用的是array,不知道开发者是如何考虑的,当然省去了new,也是满有新意的:
代码如下:
class a { function b($c) { echo $c; } } call_user_func(array("a", "b"),"111"); //显示 111 ?>
call_user_func_array函数和call_user_func很相似,只不过是换了一种方式传递了参数,让参数的结构更清晰:
代码如下:
function a($b, $c) { echo $b; echo $c; } call_user_func_array('a', array("111", "222")); //显示 111 222 ?>
call_user_func_array函数也可以调用类内部的方法的
代码如下:
Class ClassA { function bc($b, $c) { $bc = $b + $c; echo $bc; } } call_user_func_array(array('ClassA','bc'), array("111", "222")); //显示 333 ?>
call_user_func函数和call_user_func_array函数都支持引用,这让他们和普通的函数调用更趋于功能一致:
代码如下:
function a($b) { $b++; } $c = 0; call_user_func('a', $c); echo $c;//显示 1 call_user_func_array('a', array($c)); echo $c;//显示 2
另:call_user_func函数和call_user_func_array函数都支持引用。
代码如下:
<?php function increment(&$var) { $var++; } $a = 0; call_user_func('increment', $a); echo $a; // 0 call_user_func_array('increment', array(&$a)); // You can use this instead echo $a; // 1 ?>
【相关教程推荐】
2. php从入门到精通
3. bootstrap教程

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











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,

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.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

In PHP8, match expressions are a new control structure that returns different results based on the value of the expression. 1) It is similar to a switch statement, but returns a value instead of an execution statement block. 2) The match expression is strictly compared (===), which improves security. 3) It avoids possible break omissions in switch statements and enhances the simplicity and readability of the code.
