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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 |
|---|---|
| 713 | * Filters the fourth-row list of TinyMCE buttons (Visual tab). |
| 714 | * |
| 715 | * @since 2.5.0 |
| 716 | * @since 3.3.0 The `$editor_id` parameter was added. |
| 717 | * |
| 718 | * @param array $mce_buttons_4 Fourth-row list of buttons. |
| 719 | * @param string $editor_id Unique editor identifier, e.g. 'content'. Accepts 'classic-block' |
| 720 | * when called from block editor's Classic block. |
| 721 | */ |
| 722 | $mce_buttons_4 = apply_filters( 'mce_buttons_4', array(), $editor_id ); |
| 723 | } |
| 724 | |
| 725 | $body_class = $editor_id; |
| 726 | |
| 727 | $post = get_post(); |
| 728 | if ( $post ) { |
| 729 | $body_class .= ' post-type-' . sanitize_html_class( $post->post_type ) . ' post-status-' . sanitize_html_class( $post->post_status ); |
| 730 | |
| 731 | if ( post_type_supports( $post->post_type, 'post-formats' ) ) { |