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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 |
|---|---|
| 822 | /** |
| 823 | * Filter the default legacy contextual help text. |
| 824 | * |
| 825 | * @since 2.8.0 |
| 826 | * @deprecated 3.3.0 Use get_current_screen()->add_help_tab() or |
| 827 | * get_current_screen()->remove_help_tab() instead. |
| 828 | * |
| 829 | * @param string $old_help_default Default contextual help text. |
| 830 | */ |
| 831 | $default_help = apply_filters( 'default_contextual_help', '' ); |
| 832 | if ( $default_help ) |
| 833 | $old_help = '<p>' . $default_help . '</p>'; |
| 834 | } |
| 835 | |
| 836 | if ( $old_help ) { |
| 837 | $this->add_help_tab( array( |
| 838 | 'id' => 'old-contextual-help', |
| 839 | 'title' => __('Overview'), |
| 840 | 'content' => $old_help, |