OPCodes, the execution units the PHP's Virtual Machine executes, can be listed and inspected, to reveal performance and code structure caveats and improvements.
Drupal 7, released early 2011, will receive bug fix and security fixes until end of 2022. This makes Drupal 7 one of the longest supported PHP projects in history.
PHP 7.3.26 will be the last bug-fix release, and will only receive security fixes for one year.
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