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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。
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