PHP ereg_replace()函数的工作原理解析
我们在学习PHP ereg_replace()函数原型:string ereg_replace (string $pattern, string $replacement, string $string)
string eregi_replace (string $pattern, string $replacement, string $string)
PHP ereg_replace()函数c,并将所匹配结果替换为$replacement。当$pattern中包含模式单元(或子模式)时,$replacement中形如“1”或“$1”的位置将依次被这些子模式所匹配的内容替换。而“”或“$0”是指整个的匹配字符串的内容。需要注意的是,在双引号中反斜线作为转义符使用,所以必须使用“\0”,“\1”的形式。
eregi_replace()和PHP ereg_replace()函数的功能一致,只是前者忽略大小写。代码6.6是本函数的应用实例,这段代码演示了如何对程序源代码做简单的清理工作。
PHP ereg_replace()函数代码6.6 源代码的清理
<ol class="dp-xml"> <li class="alt"><span><span class="tag"><span> ?php </span></span></span></li> <li> <span>$</span><span class="attribute">lines</span><span> = </span><span class="attribute-value">file</span><span>('source.php'); //将文件读入数组中 </span> </li> <li class="alt"> <span>for($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>; $i</span><span class="tag"><span class="tag-name">count</span><span>($lines); $i++) </span></span> </li> <li><span>{ </span></li> <li class="alt"><span>//将行末以“\”或“#”开头的注释去掉 </span></li> <li><span>$lines[$i] = eregi_replace("(//|#).*$", "", $lines[$i]); </span></li> <li class="alt"><span>//将行末的空白消除 </span></li> <li><span>$lines[$i] = eregi_replace("[ nrtvf]*$", "rn", $lines[$i]); </span></li> <li class="alt"><span>} </span></li> <li><span>//整理后输出到页面 </span></li> <li class="alt"><span>echo htmlspecialchars(join("",$lines)); </span></li> <li> <span class="tag">?></span><span> </span> </li> </ol>
以上就是PHP ereg_replace()函数的相关用法介绍。

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,

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

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

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.
