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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 |
|---|---|
| 1316 | */ |
| 1317 | function do_robots() { |
| 1318 | header( 'Content-Type: text/plain; charset=utf-8' ); |
| 1319 | |
| 1320 | /** |
| 1321 | * Fires when displaying the robots.txt file. |
| 1322 | * |
| 1323 | * @since 2.1.0 |
| 1324 | */ |
| 1325 | do_action( 'do_robotstxt' ); |
| 1326 | |
| 1327 | $output = "User-agent: *\n"; |
| 1328 | $public = get_option( 'blog_public' ); |
| 1329 | if ( '0' == $public ) { |
| 1330 | $output .= "Disallow: /\n"; |
| 1331 | } else { |
| 1332 | $site_url = parse_url( site_url() ); |
| 1333 | $path = ( !empty( $site_url['path'] ) ) ? $site_url['path'] : ''; |
| 1334 | $output .= "Disallow: $path/wp-admin/\n"; |