php正则preg_replace_callback函数用法实例
这篇文章主要介绍了php正则preg_replace_callback函数用法,实例分析了preg_replace_callback函数进行正则替换的相关技巧,需要的朋友可以参考下
本文实例讲述了php正则preg_replace_callback函数的用法，分享给大家供大家参考，具体实现方法如下：
php正则表达式功能强大，本范例演示了preg_replace_callback函数的用法
- // Define a dummy text, for testing...
- $Text = "Title: Hello world!\n";
- $Text .= "Author: Jonas\n";
- $Text .= "This is a example message!\n\n";
- $Text .= "Title: Entry 2\n";
- $Text .= "Author: Sonja\n";
- $Text .= "Hello world, what's up!\n";
- // This function will replace specific matches
- // into a new form
- function RewriteText($Match){
- // Entire matched section:
- // --> /.../
- $EntireSection = $Match[0];
- // --> "\nTitle: Hello world!"
- // Key
- // --> ([a-z0-9]+)
- $Key = $Match[1];
- // --> "Title"
- // Value
- // --> ([^\n\r]+)
- $Value = $Match[2];
- // --> "Hello world!"
- // Add some bold (<b>) tags to around the key to
- return '<b>' . $Key . '</b>: ' . $Value;
- }
- // The regular expression will extract and pass all "key: value" pairs to
- // the "RewriteText" function that is definied above
- $NewText = preg_replace_callback('/[\r\n]([a-z0-9]+): ([^\n\r]+)/i', "RewriteText", $Text);
- // Print the new modified text
- print $NewText;
希望本文所述对大家的php程序设计有所帮助。