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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 |
|---|---|
| 1050 | * The echo content should be with usage of the permalinks or for creating the |
| 1051 | * robots.txt file. |
| 1052 | * |
| 1053 | * @since 2.1.0 |
| 1054 | * @uses do_action() Calls 'do_robotstxt' hook for displaying robots.txt rules. |
| 1055 | */ |
| 1056 | function do_robots() { |
| 1057 | header( 'Content-Type: text/plain; charset=utf-8' ); |
| 1058 | |
| 1059 | do_action( 'do_robotstxt' ); |
| 1060 | |
| 1061 | $output = "User-agent: *\n"; |
| 1062 | $public = get_option( 'blog_public' ); |
| 1063 | if ( '0' == $public ) { |
| 1064 | $output .= "Disallow: /\n"; |
| 1065 | } else { |
| 1066 | $site_url = parse_url( site_url() ); |
| 1067 | $path = ( !empty( $site_url['path'] ) ) ? $site_url['path'] : ''; |
| 1068 | $output .= "Disallow: $path/wp-admin/\n"; |