WordPress Reliability Glossary

A catastrophic PHP execution failure that halts execution immediately.

A blank screen served with an HTTP 500 status when error reporting is suppressed.

Incompatible code between two or more plugins causing unexpected crashes or behavioral bugs.

A private clone of a website used to test changes safely before touching production.

The act of instantly restoring a prior working version of software after a bad update.

Automated continuous pinging of a web server to verify accessibility and response time.

The specific release of the programming language powering your WordPress core and plugins.

The relational database storage engine where WordPress stores all content, orders, and settings.

Pre-computed static snapshots and memory pools used to deliver pages at maximum speed.

A documented security weakness in plugin or theme code that could allow unauthorized access.

The mission-critical e-commerce funnel handling customer cart data and payment gateways.

A high-priority script in wp-content/mu-plugins that runs automatically before standard plugins.