WP_REST_Request::get_param( string $key ): mixed|null

Source

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;
}

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