Replace domain in wordpress configuration

index.php

//Insert here serialized string from wp_options table
$str = '';

function change(&$data)
		{
			if(is_string($data) && json_decode($data)){
				$json = json_decode($data);
				if(is_array($json) || is_object($json)){
					foreach($json as &$jsonvalue){
						change($jsonvalue);
					}
					$data = json_encode($json);
				}
				return;
			}else if(is_array($data) || is_object($data)){
				foreach($data as &$value){
					change($value);
				}
				return;
			}

			if(is_string($data)){
				//Set here old string to replace
				$old = 'oldomain.tld/subdir'
				
				//Set here new string
				$new = 'newdomain.tld'
				
				$data = str_replace($old, $new, $data);
			}
		}
		
foreach($code as &$value){
			change($value);
		}
		
		header("Content-Type: text/plain");
		echo serialize($code);
		die();