请教大神preg_replace如何替换成preg_replace_callback

 private function escapereserved($query)  {               $search = array ("/({)(w+)(})/e",                          "/({l#)([0-9]+)(})/e", 		          "/(:)(uid|session|file|access|mode|comment|desc|size|start|end)/e",                        )	    $replace = array ("'"\1'.strtoupper('\2').'\3"'",				          "'"\1'.strtoupper('\2').'\3"'",				          "'\1'.'db_'.'\2'.'\3'",)			          return preg_replace($search, $replace, $query);  	  }

$s = '{Test}{L#123456}:uid';echo escapeReserved($s);// "{TEST}""{L#123456}":db_uidecho '<br>';echo test($s);//"{TEST}""{L#123456}":db_uidfunction escapeReserved($query){	$search = array ("/({)(w+)(})/e", 		"/({L#)([0-9]+)(})/e", 		"/(:)(uid|session|file|access|mode|comment|desc|size|start|end)/e"); 	$replace = array ("'"\1'.strtoupper('\2').'\3"'",		"'"\1'.strtoupper('\2').'\3"'",		"'\1'.'db_'.'\2'.'\3'");		 	return preg_replace($search, $replace, $query); }function test($query){	$search = array ("/({)(w+)(})/", 		"/({L#)([0-9]+)(})/", 		"/(:)(uid|session|file|access|mode|comment|desc|size|start|end)/");	return preg_replace_callback($search, function($m) {		if(isset($m[3])){			return '"'.$m[1].strtoupper($m[2]).$m[3].'"';		}else{			return "$m[1]db_$m[2]";		}       }, $query);}