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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 |
|---|---|
| 648 | * |
| 649 | * @since 3.3.0 |
| 650 | */ |
| 651 | public function render_screen_meta() { |
| 652 | |
| 653 | // Call old contextual_help_list filter. |
| 654 | self::$_old_compat_help = apply_filters( 'contextual_help_list', self::$_old_compat_help, $this ); |
| 655 | |
| 656 | $old_help = isset( self::$_old_compat_help[ $this->id ] ) ? self::$_old_compat_help[ $this->id ] : ''; |
| 657 | $old_help = apply_filters( 'contextual_help', $old_help, $this->id, $this ); |
| 658 | |
| 659 | // Default help only if there is no old-style block of text and no new-style help tabs. |
| 660 | if ( empty( $old_help ) && empty( $this->_help_tabs ) ) { |
| 661 | $default_help = apply_filters( 'default_contextual_help', '' ); |
| 662 | if ( $default_help ) |
| 663 | $old_help = '<p>' . $default_help . '</p>'; |
| 664 | } |
| 665 | |
| 666 | if ( $old_help ) { |