For https://zerobscrm.com/kb/knowledge-base/adding-custom-tabs-to-contact-view-or-company-view/

ZBSCRM-Custom-Contact-Tab-Function

function zbsCustom_modifyTabs( $arr, $id ) {
    
    // this is just a check :)
    if (!is_array($arr)) $arr = array();

    // Here we add the new tab
    // 	'id' = Represents HTML id attribute, must be unique & html-attribute format (e.g. a-b-c)
    //	'name' = Title string
    //  'content' = the HTML you want to display in your tab (you could use another function to produce this)
    $arr[] = array(
    	'id' => 'example-tab',
    	'name' => 'Example Tab',
    	'content' => '<h2>The Company ID is: '.$id.'</h2>'
    	);

    return $arr;
}