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.

Source

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

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