You are overkilling the idea of the query to get the url. The simplest way and best way at the same time is: <?php // get_the_ID() will return the current’s post id // get_the_permalink() will return the current url $current_url = get_the_permalink(get_the_ID()); ?> That function will not echo, but rather return/get the permalink url for … Read more
There aren’t any for plugins, but you can (and should) use WP_CONTENT_DIR, instead of ABSPATH. For themes you have locate_template().
When writing a plugin, I define a few constants including the path to the plugin’s root folder, and its “name” as used in some admin hooks: define(‘WPSE_102681_PLUGIN_NAME’, basename(dirname(__FILE__)) . “https://wordpress.stackexchange.com/” . basename(__FILE__)); I’ve found that plugins_url() happily takes that constant, which is useful when referencing files from subfolders of the plugin, like so: echo plugins_url(‘images/information.png’, … Read more
__DIR__ is rather new and not always supported. Use dirname( __FILE__ ). plugins_url() is using … $folder = dirname(plugin_basename($plugin)); … so yes, it is safe. Just use plugins_url( ‘subfolder/file.css’, dirname( __FILE__ ) )