php正则preg_replace_callback函数用法实例

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 formfunction 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 textprint $NewText;

希望本文所述对大家的php程序设计有所帮助。