WP_REST_Request::set_param( string $key, mixed $value )

Source

/**
 * Sets a parameter on the request.
 *
 * If the given parameter key exists in any parameter type an update will take place,
 * otherwise a new param will be created in the first parameter type (respecting
 * get_parameter_order()).
 *
 * @since 4.4.0
 *
 * @param string $key   Parameter name.
 * @param mixed  $value Parameter value.
 */
public function set_param( $key, $value ) {
	$order     = $this->get_parameter_order();
	$found_key = false;

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