I am running an API library on my server running PHP 5.5.3 and when I try and fire a request I get a notice saying that JSON_HEX_TAG, JSON_HEX_APOS, JSON_HEX_QUOT, and JSON_HEX_AMP are not defined.
Notice: Use of undefined constant JSON_HEX_QUOT - assumed 'JSON_HEX_QUOT' in /path/to/library/SendGrid/Email.php on line 303
From what I have read it sounds like these should be there on any PHP version 5.3 or above. This is an Ubuntu box running Nginx, PHP-FPM, and PHP 5.5. Any thoughts why these would keep coming up? Thank you!