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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 |
|---|---|
| 1703 | * The echo content should be with usage of the permalinks or for creating the |
| 1704 | * robot.txt file. |
| 1705 | * |
| 1706 | * @since 2.1.0 |
| 1707 | * @uses do_action() Calls 'do_robotstxt' hook for displaying robot.txt rules. |
| 1708 | */ |
| 1709 | function do_robots() { |
| 1710 | header( 'Content-Type: text/plain; charset=utf-8' ); |
| 1711 | |
| 1712 | do_action( 'do_robotstxt' ); |
| 1713 | |
| 1714 | if ( '0' == get_option( 'blog_public' ) ) { |
| 1715 | echo "User-agent: *\n"; |
| 1716 | echo "Disallow: /\n"; |
| 1717 | } else { |
| 1718 | echo "User-agent: *\n"; |
| 1719 | echo "Disallow:\n"; |
| 1720 | } |
| 1721 | } |