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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 |
|---|---|
| 1839 | * The echo content should be with usage of the permalinks or for creating the |
| 1840 | * robots.txt file. |
| 1841 | * |
| 1842 | * @since 2.1.0 |
| 1843 | * @uses do_action() Calls 'do_robotstxt' hook for displaying robots.txt rules. |
| 1844 | */ |
| 1845 | function do_robots() { |
| 1846 | header( 'Content-Type: text/plain; charset=utf-8' ); |
| 1847 | |
| 1848 | do_action( 'do_robotstxt' ); |
| 1849 | |
| 1850 | $output = "User-agent: *\n"; |
| 1851 | $public = get_option( 'blog_public' ); |
| 1852 | if ( '0' == $public ) { |
| 1853 | $output .= "Disallow: /\n"; |
| 1854 | } else { |
| 1855 | $site_url = parse_url( site_url() ); |
| 1856 | $path = ( !empty( $site_url['path'] ) ) ? $site_url['path'] : ''; |
| 1857 | $output .= "Disallow: $path/wp-admin/\n"; |