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 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。

php正则preg_replace_callback函数用法实例

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