- var_dump: documentation ( source)
- json_encode: documentation ( source)
<?php
var_dump(json_encode('{"<B20ACD4A-36AB-48FF-A749-9BEE3B2BAEA5>": "https://api.mailgun.net/v2/domains/goodfoodpro.mailgun.org/messages/WyI2ODg1MGZlNjQ2IiwgWyIxNWYzNmM2Ni1hNGNjLTExZTMtYmNiYS1iYzc2NGUxMDRjMjQiLCAiMTVmNGVmNTAtYTRjYy0xMWUzLWJjYmEtYmM3NjRlMTA0YzI0IiwgIjE1ZjYyOGI2LWE0Y2MtMTFlMy1iY2JhLWJjNzY0ZTEwNGMyNCJdLCAibWFpbGd1biJd/attachments/0"}'), false);