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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 |
|---|---|
| 757 | * Render the screen's help section. |
| 758 | * |
| 759 | * This will trigger the deprecated filters for backwards compatibility. |
| 760 | * |
| 761 | * @since 3.3.0 |
| 762 | */ |
| 763 | public function render_screen_meta() { |
| 764 | |
| 765 | // Call old contextual_help_list filter. |
| 766 | self::$_old_compat_help = apply_filters( 'contextual_help_list', self::$_old_compat_help, $this ); |
| 767 | |
| 768 | $old_help = isset( self::$_old_compat_help[ $this->id ] ) ? self::$_old_compat_help[ $this->id ] : ''; |
| 769 | $old_help = apply_filters( 'contextual_help', $old_help, $this->id, $this ); |
| 770 | |
| 771 | // Default help only if there is no old-style block of text and no new-style help tabs. |
| 772 | if ( empty( $old_help ) && ! $this->get_help_tabs() ) { |
| 773 | $default_help = apply_filters( 'default_contextual_help', '' ); |
| 774 | if ( $default_help ) |
| 775 | $old_help = '<p>' . $default_help . '</p>'; |