Need function to remove visual editor toolbar button based on role.

Trying to remove a button from the visual editor toolbar based on the users role.

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Button source:
<button id=”mceu_16-open” tabindex=”-1″ type=”button” role=”presentation”>
<i class=”mce-ico mce-i-icon wsalestoolbox-own-icon”></i>
<span></span>
<i class=”mce-caret”></i>
</button>
</div>

Someone gave the below function but I can’t get it to work and don’t really understand how this would work? Is it close?

if( !function_exists('wpmu_hide_itmes') ):
	function wpmu_hide_itmes($buttons)
	 {	

		  //do not remoe any button if its super admin or pro users
		  if(current_user_can('pro') or is_super_admin() ) return $buttons;

		  //Remove the text color selector
		  $remove = array( 'icon' );

		  //Find the array key and then unset
		  if($remove){
			  foreach ($remove as $vlaue){

				   if ( ( $key = array_search($vlaue,$buttons) ) !== false )
						unset($buttons[$key]);
			  }
		  }

		  return $buttons;
	 }
endif;
add_filter('mce_buttons','wpmu_hide_itmes');