wp_dropdown_cats( int $current_cat = 0, int $current_parent = 0, int $category_parent = 0, int $level = 0, array $categories = 0 ): void|false

137function wp_dropdown_cats( $current_cat = 0, $current_parent = 0, $category_parent = 0, $level = 0, $categories = 0 ) {138	_deprecated_function( __FUNCTION__, '3.0.0', 'wp_dropdown_categories()' );139	if (!$categories )140		$categories = get_categories( array('hide_empty' => 0) );141 142	if ( $categories ) {143		foreach ( $categories as $category ) {144			if ( $current_cat != $category->term_id && $category_parent == $category->parent) {145				$pad = str_repeat( '&#8211; ', $level );146				$category->name = esc_html( $category->name );147				echo "\n\t<option value='$category->term_id'";148				if ( $current_parent == $category->term_id )149					echo " selected='selected'";150				echo ">$pad$category->name</option>";151				wp_dropdown_cats( $current_cat, $current_parent, $category->term_id, $level +1, $categories );152			}153		}154	} else {155		return false;156	}157}