WordPress Version Compatibility — a practical guide to WordPress Requires at least with clear examples you can reuse in real projects.
WordPress Plugin Development Series (79/95). Prefer one article? Read the complete WordPress plugin development tutorial.
Short description
Use “Requires at least” accurately. Avoid relying on functions that do not exist in your minimum version without guards.
Function exists guard
if (function_exists('wp_get_theme')) {
// safe to call
}