worker_processes × worker_connections gets quoted as nginx’s capacity, and for a static file server it is roughly right. For anything proxying to PHP-FPM it is out by a…
Iterating by reference is the standard way to modify an array in place. What almost nobody remembers is that the loop variable survives the loop, still bound to…
A plugin that fetches a feed URL entered by a user is a server-side request forgery waiting to happen: the URL can be http://127.0.0.1:11211/, or the private address…
A cache goes in, the page gets faster, and that is usually where the measurement stops. Redis has been counting every lookup since it started and will tell…
APC did two unrelated jobs: it cached compiled opcodes, and it offered a shared-memory key/value store to application code. PHP 5.5 bundles Zend OPcache and takes the first…
Every other file in a child theme replaces its parent equivalent: drop in single.php and the parent’s is not loaded. functions.php is the exception — both are included,…
The container is the part that gets discussed, and the kernel features underneath it — cgroups and namespaces — have been in Linux for years and are what…
Inside a namespace, an unqualified call to count() is not a call to count(). PHP looks for AppImportcount() first, fails to find it, and only then falls back…
A backup script that works when you run it and does nothing at three in the morning is almost always PATH. cron reads neither .bashrc nor /etc/profile; it…