wp-includes/rest-api/class-wp-rest-request.php:408Retrieves a parameter from the request.
$keystringmixed|null public function get_param( $key ) { $order = $this->get_parameter_order(); foreach ( $order as $type ) { // Determine if we have the parameter for this type. if ( isset( $this->params[ $type ][ $key ] ) ) { return $this->params[ $type ][ $key ]; } } return null; }Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rest-api/class-wp-rest-request.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.