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
//Defineadummytext,fortesting... $Text="Title:Helloworld!\n"; $Text.="Author:Jonas\n"; $Text.="Thisisaexamplemessage!\n\n"; $Text.="Title:Entry2\n"; $Text.="Author:Sonja\n"; $Text.="Helloworld,what'sup!\n"; //Thisfunctionwillreplacespecificmatches //intoanewform functionRewriteText($Match){ //Entirematchedsection: //-->/.../ $EntireSection=$Match[0]; //-->"\nTitle:Helloworld!" //Key //-->([a-z0-9]+) $Key=$Match[1]; //-->"Title" //Value //-->([^\n\r]+) $Value=$Match[2]; //-->"Helloworld!" //Addsomebold(<b>)tagstoaroundthekeyto return'<b>'.$Key.'</b>:'.$Value; } //Theregularexpressionwillextractandpassall"key:value"pairsto //the"RewriteText"functionthatisdefiniedabove $NewText=preg_replace_callback('/[\r\n]([a-z0-9]+):([^\n\r]+)/i',"RewriteText",$Text); //Printthenewmodifiedtext print$NewText;
希望本文所述对大家的php程序设计有所帮助。