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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 |
|---|---|
| 701 | * Filters the third-row list of TinyMCE buttons (Visual tab). |
| 702 | * |
| 703 | * @since 2.0.0 |
| 704 | * @since 3.3.0 The `$editor_id` parameter was added. |
| 705 | * |
| 706 | * @param array $mce_buttons_3 Third-row list of buttons. |
| 707 | * @param string $editor_id Unique editor identifier, e.g. 'content'. Accepts 'classic-block' |
| 708 | * when called from block editor's Classic block. |
| 709 | */ |
| 710 | $mce_buttons_3 = apply_filters( 'mce_buttons_3', array(), $editor_id ); |
| 711 | |
| 712 | /** |
| 713 | * Filters the fourth-row list of TinyMCE buttons (Visual tab). |
| 714 | * |
| 715 | * @since 2.5.0 |
| 716 | * @since 3.3.0 The `$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' |