WP_Feed_Cache_Transient::save( array|SimplePieSimplePie $data ): true

Source

public function save( $data ) {
	if ( $data instanceof SimplePie\SimplePie ) {
		$data = $data->data;
	}

	set_transient( $this->name, $data, $this->lifetime );
	set_transient( $this->mod_name, time(), $this->lifetime );
	return true;
}

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