C语言和PHP语法相异点
C语言和PHP语法相异点技术
maybe yes 发表于2015-02-05 16:09
PHP 的语法规则和 C 语言语法规则非常的相似，PHP 中很多内部函数调用的就是原生的 C 语言函数。由于两种语言的运行方式不同，导致在某些情况下语法也有一些差异，下面列举几个。
获取全局变量方式不同
在作用域中获取全局变量的值，PHP 必须借助 global 关键字获取或者使用超全局变量 $GLOBAL 去访问外部变量值。C语言相对简单点，在局部作用域中若没有相同的变量名称则访问的就是外部声明的变量的值。
初始化（Initializer）变量不同
C 语法中全局变量初始化时，只能使用常量表达式（Constant Expression）初始化。在 PHP 语法中，初始化变量可以使用任意表达式。
函数嵌套不同
C 语言不允许嵌套定义函数，在一个函数体中可以声明另一个函数，但不能定义另一个函数（但gcc的扩展特性允许嵌套定义函数）。PHP 允许嵌套定义函数，可以经常看到在函数体中或者 IF 语句中有定义了另一个函数，只要能保证调用嵌套函数的顺序在运行了嵌套语句之后即可。
阅(91)评(0)查看评论
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
Working with Flash Session Data in Laravel
Mar 12, 2025 pm 05:08 PM
Laravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-
Build a React App With a Laravel Back End: Part 2, React
Mar 04, 2025 am 09:33 AM
This is the second and final part of the series on building a React application with a Laravel back-end. In the first part of the series, we created a RESTful API using Laravel for a basic product-listing application. In this tutorial, we will be dev
cURL in PHP: How to Use the PHP cURL Extension in REST APIs
Mar 14, 2025 am 11:42 AM
The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.
Simplified HTTP Response Mocking in Laravel Tests
Mar 12, 2025 pm 05:09 PM
Laravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>
12 Best PHP Chat Scripts on CodeCanyon
Mar 13, 2025 pm 12:08 PM
Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom
Notifications in Laravel
Mar 04, 2025 am 09:22 AM
In this article, we're going to explore the notification system in the Laravel web framework. The notification system in Laravel allows you to send notifications to users over different channels. Today, we'll discuss how you can send notifications ov
Explain the concept of late static binding in PHP.
Mar 21, 2025 pm 01:33 PM
Article discusses late static binding (LSB) in PHP, introduced in PHP 5.3, allowing runtime resolution of static method calls for more flexible inheritance.Main issue: LSB vs. traditional polymorphism; LSB's practical applications and potential perfo
PHP Logging: Best Practices for PHP Log Analysis
Mar 10, 2025 pm 02:32 PM
PHP logging is essential for monitoring and debugging web applications, as well as capturing critical events, errors, and runtime behavior. It provides valuable insights into system performance, helps identify issues, and supports faster troubleshoot
