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 () tags to around the key to return '' . $Key . ': ' . $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。