WP_Post_Type::add_supports()

Source

public function add_supports() {
	if ( ! empty( $this->supports ) ) {
		foreach ( $this->supports as $feature => $args ) {
			if ( is_array( $args ) ) {
				add_post_type_support( $this->name, $feature, $args );
			} else {
				add_post_type_support( $this->name, $args );
			}
		}
		unset( $this->supports );

		/*
		 * 'editor' support implies 'autosave' support for backward compatibility.
		 * 'autosave' support needs to be explicitly removed if not desired.
		 */
		if (
			post_type_supports( $this->name, 'editor' ) &&
			! post_type_supports( $this->name, 'autosave' )
		) {
			add_post_type_support( $this->name, 'autosave' );
		}
	} elseif ( false !== $this->supports ) {
		// Add default features.
		add_post_type_support( $this->name, array( 'title', 'editor', 'autosave' ) );
	}
}

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