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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 |
---|---|
768 | * |
769 | * @since 2.7.0 |
770 | * @deprecated 3.3.0 Use get_current_screen()->add_help_tab() or |
771 | * get_current_screen()->remove_help_tab() instead. |
772 | * |
773 | * @param string $old_help Help text that appears on the screen. |
774 | * @param string $screen_id Screen ID. |
775 | * @param WP_Screen $this Current WP_Screen instance. |
776 | */ |
777 | $old_help = apply_filters( 'contextual_help', $old_help, $this->id, $this ); |
778 |
|
779 | // Default help only if there is no old-style block of text and no new-style help tabs. |
780 | if ( empty( $old_help ) && ! $this->get_help_tabs() ) { |
781 |
|
782 | /** |
783 | * Filters the default legacy contextual help text. |
784 | * |
785 | * @since 2.8.0 |
786 | * @deprecated 3.3.0 Use get_current_screen()->add_help_tab() or |