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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 |
|---|---|
| 810 | * @since 2.7.0 |
| 811 | * @deprecated 3.3.0 Use get_current_screen()->add_help_tab() or |
| 812 | * get_current_screen()->remove_help_tab() instead. |
| 813 | * |
| 814 | * @param string $old_help Help text that appears on the screen. |
| 815 | * @param string $screen_id Screen ID. |
| 816 | * @param WP_Screen $this Current WP_Screen instance. |
| 817 | * |
| 818 | */ |
| 819 | $old_help = apply_filters( 'contextual_help', $old_help, $this->id, $this ); |
| 820 | |
| 821 | // Default help only if there is no old-style block of text and no new-style help tabs. |
| 822 | if ( empty( $old_help ) && ! $this->get_help_tabs() ) { |
| 823 | |
| 824 | /** |
| 825 | * Filter the default legacy contextual help text. |
| 826 | * |
| 827 | * @since 2.8.0 |
| 828 | * @deprecated 3.3.0 Use get_current_screen()->add_help_tab() or |