- var_dump: documentation ( source)
- json_decode: documentation ( source)
<?php
var_dump(json_decode('{"$and":[{"created":{"$gt":{"sec":1406847599,"inc":178}}},{"created":{"$lt":{"sec":1409526000,"inc":179}}},{"campaign_id":121},{"valid":true},{"quarantined":false},{"billable":true}]}'));