Create function to prevent function deprecation message in PHP 8.2

[jrbarros]

Description of changes:
Implements function to check if function mb_convert_encoding exists to avoid PHP 8.2 deprecation message

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[jrbarros]

@peterader Can you help me talk to another mod to approve or deny this PR

[yenfryherrerafeliz]

Hi @jrbarros, sorry for the delay on answering this. I see that you are proposing utf8_encode as an alternative for mb_convert_encoding, but utf8_encode is actually deprecated in php 8.2, and hence you will keep getting deprecation warnings. Here is the link to php docs. We did a recent change on SsoTokenProvider where we introduced utf8_encode again. However, this probably needs to be reconsidered again.

Thanks!

[yenfryherrerafeliz]

Hi @jrbarros, thanks for this contribution. We will close this one for now since we need to keep mb_convert_encoding over utf8_encode, since utf8_encode is going to be deprecated in PHP 8.2.

Thanks!