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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 1848 | if ( !empty($plugin) && is_string($plugin) ) { |
| 1849 | $folder = dirname(plugin_basename($plugin)); |
| 1850 | if ('.' != $folder) |
| 1851 | $url .= '/' . ltrim($folder, '/'); |
| 1852 | } |
| 1853 | |
| 1854 | if ( !empty($path) && is_string($path) && strpos($path, '..') === false ) |
| 1855 | $url .= '/' . ltrim($path, '/'); |
| 1856 | |
| 1857 | return apply_filters('plugins_url', $url, $path, $plugin); |
| 1858 | } |
| 1859 | |
| 1860 | /** |
| 1861 | * Output rel=canonical for singular queries |
| 1862 | * |
| 1863 | * @package WordPress |
| 1864 | * @since 2.9.0 |
| 1865 | */ |
| 1866 | function rel_canonical() { |