$parser-> not working?

[ThistleProse]

Hello!

This piece of code used to work, but after upgrading my PHP it no longer does. I'm not sure why and was hoping for some assistance

Code:

<? print $parser->parse_message(htmlspecialchars_decode($userfields['fid52']),array("allow_mycode" => 1)); ?>

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PHP version:  PHP Version 7.2.26
MyBB version: 1.8.22
SQL version: MySQLi 5.6.47

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PS; Is there any way to force all the $userfields to parse the MyCode? Without having to use some variation of the code above on each one?