Class WP_Config
Thin wrapper around the bundled wp-cli/wp-config-transformer library used to safely
add/update/remove PHP constants in wp-config.php. Backs the api_key settings field type,
whose secret values are stored as constants instead of in the um_options DB array.
$lib_path : string
Path to the bundled WPConfigTransformer library.
Mirrors the Action Scheduler bundling convention (\um\action_scheduler\Init) — the
file is copied into includes/lib/ at build time via the wp-config-transformer composer script.
set_constant(string $name, string $value) : bool
Add or update a constant in wp-config.php.
Uses WPConfigTransformer::update() with add => true, which replaces the value in place
when the constant already exists and adds it otherwise — so it never duplicates a define().
| string | $name | Constant name. |
| string | $value | Constant value. |
True on success, false on failure (e.g. wp-config.php not writable).
flush_config_opcache() : mixed
Invalidate the OPcache entry for wp-config.php after writing to it.
OPcache caches the compiled wp-config.php and only revalidates its mtime every
opcache.revalidate_freq seconds (default 2). Without this, the redirect that follows a
settings save reloads the stale wp-config.php, so a freshly written constant isn't defined
yet and the field renders empty until the next request. Forcing invalidation makes the new
constant available on the very next request.