PHP is a popular programming language that is widely used to build dynamic and interactive web applications. However, as the complexity and scale ...
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APC, XCache, and eAccelerator are deprecated, you can still use e.g. APCu or Redis or Memcache for caching,... APCu could share memory between php-fpm processes
Quotes are not relevant for the performance... the only way to speed things up, are profiling
Global variables has nothing to do with performance but you are right, avoiding them is a good practice
Yes, using newer versions of php are mostly faster
Non prepare statements are faster if you do the query only once, if you do many similar queries then the extra prepare connection can be worth it.
4.- The last php8 version comes with JIT compiler which opens new chances for php as a language beyond web applications