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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 |
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745 | * |
746 | * @since 3.3.0 |
747 | */ |
748 | public function render_screen_meta() { |
749 |
|
750 | // Call old contextual_help_list filter. |
751 | self::$_old_compat_help = apply_filters( 'contextual_help_list', self::$_old_compat_help, $this ); |
752 |
|
753 | $old_help = isset( self::$_old_compat_help[ $this->id ] ) ? self::$_old_compat_help[ $this->id ] : ''; |
754 | $old_help = apply_filters( 'contextual_help', $old_help, $this->id, $this ); |
755 |
|
756 | // Default help only if there is no old-style block of text and no new-style help tabs. |
757 | if ( empty( $old_help ) && ! $this->get_help_tabs() ) { |
758 | $default_help = apply_filters( 'default_contextual_help', '' ); |
759 | if ( $default_help ) |
760 | $old_help = '<p>' . $default_help . '</p>'; |
761 | } |
762 |
|
763 | if ( $old_help ) { |