mce_buttons_4 – Hook | Developer.WordPress.org

apply_filters( ‘mce_buttons_4’, array $mce_buttons_4, string $editor_id )

Filters the fourth-row list of TinyMCE buttons (Visual tab).

Parameters

$mce_buttons_4array: Fourth-row list of buttons.
$editor_idstring: Unique editor identifier, e.g. 'content'. Accepts 'classic-block' when called from block editor’s Classic block.

$mce_buttons_4 = apply_filters( 'mce_buttons_4', array(), $editor_id );

Used by	Description
wp_tinymce_inline_scripts()`wp-includes/script-loader.php`	Adds inline scripts required for the TinyMCE in the block editor.
_WP_Editors::editor_settings()`wp-includes/class-wp-editor.php`

Version	Description
3.3.0	The `$editor_id` parameter was added.
2.5.0	Introduced.

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