Website optimalization

Not directly speeding up your website, but for "good feeling".

psalm - https://psalm.dev/docs/ php inspections - https://plugins.jetbrains.com/plugin/7622-php-inspections-ea-extended-

https://www.webpagetest.org/ https://gtmetrix.com/

Is foreach in php faster than while?

Is condition with == faster than ===?

https://phpbench.com/