Android : PHP convert image to base64 to json, then send it to android

I tried to convert image to base64 to json in php, then send it to android. However, it seems the image base64 json contains special characters. Anyone have any idea on this

Code:

$response["Data"] = array(); $Array["thumbnail"] = base64_encode(file_get_contents(image.jpg)); array_push($response["Data"], $Array); return urldecode(json_encode($response));