php正则preg_replace_callback函数用法实例，pregreplace正则本文实例讲述了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 () 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 textprint $newtext;
希望本文所述对大家的php程序设计有所帮助。
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