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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 |
|---|---|
| 1773 | * The echo content should be with usage of the permalinks or for creating the |
| 1774 | * robot.txt file. |
| 1775 | * |
| 1776 | * @since 2.1.0 |
| 1777 | * @uses do_action() Calls 'do_robotstxt' hook for displaying robot.txt rules. |
| 1778 | */ |
| 1779 | function do_robots() { |
| 1780 | header( 'Content-Type: text/plain; charset=utf-8' ); |
| 1781 | |
| 1782 | do_action( 'do_robotstxt' ); |
| 1783 | |
| 1784 | $output = ''; |
| 1785 | $public = get_option( 'blog_public' ); |
| 1786 | if ( '0' == $public ) { |
| 1787 | $output .= "User-agent: *\n"; |
| 1788 | $output .= "Disallow: /\n"; |
| 1789 | } else { |
| 1790 | $output .= "User-agent: *\n"; |
| 1791 | $output .= "Disallow:\n"; |