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。