请教大神preg_replace如何替换成preg_replace_callback

[沧海_]

 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);  	
  }

如何将preg_replace()替换成preg_replace_callback()呢

[果酱很好吃]

$s = '{Test}{L#123456}:uid';

echo escapeReserved($s);// "{TEST}""{L#123456}":db_uid
echo '<br>';
echo test($s);//"{TEST}""{L#123456}":db_uid

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); 
}

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);
}