You should really not use PHP 5.5 anymore. It is outdated and unsafe. They should teach you that at school ?
See:
www.php.net/eol.php
PHP 5.0 was end of life 5 years and 4 months ago!!!
I have no idea what version will still work on PHP 5.5. No guarantees, less functionality and I can give you absolutely no support on it. So you're on your own.
Or: simply get a decent server with PHP 7.4 or 8.1.
I know it's extremely old. There's nothing I can do about it, the student council has no money to pay a hosting service and the school uses that old server - they said they'll update it once they update their hardware, which is most likely never - thank you for the links and wish me luck with this 😜
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