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__call() – Allow decorators to implement custom methods

__construct() –

__get() –

__isPrivate() –

__isset() –

__set() –

__toArray() –

__toString() –

__unset() –

_caseless_remove() – Remove the items given by the keys, case insensitively from the data.

_current_time() – Wrapper for the hrtime() or microtime() functions (depending on the PHP version, one of the two is used)

_idn_uri_convert() –

_parse_message() – Parses an HTTP message into an associative array.

_parse_request_uri() – Constructs a URI for an HTTP request message.

_wpseo_activate() – Runs on activation of the plugin.

_wpseo_deactivate() – On deactivation, flush the rewrite rules so XML sitemaps stop working.

_yoast_display_alerts() – Create the alert HTML with restore/dismiss button.

_yoast_display_notifications() – Create the notifications HTML with restore/dismiss button.