Versions, extensions, limits, cron and the shell.
The settings developers come looking for: which PHP version a site runs, how to change it, which extensions are available, how to raise memory and upload limits, where the error log is, and how to schedule a cron job. Written for people who already know what they want to change and just need to know where it is.
PHP hit a problem it could not recover from — usually a broken .htaccess, a fatal error in the code, or a limit it ran straight into.
What is OPcache and should it be switched on?OPcache keeps compiled PHP in memory instead of recompiling it on every request, and there is no good reason to leave it switched off.
What is PHP-FPM and why does it matter?The process manager that runs PHP behind most modern hosting stacks, and the reason your host almost certainly already uses it.
Which PHP version should I be running?Run the newest PHP version your application supports and that still receives security updates — rarely the oldest one that merely still works.
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