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