The tooltip is a hint that displays information about an item being hovers over by mouse pointer. Tooltips do not appear on mobile operating systems, because there is no cursor. Use add_tooltip() to add tooltip to any form element by name. The default tooltip symbol is a question mark (?).
$dbForm = new C_DatabaseForm("SELECT * FROM Employees", "EmployeeID", "Employees");
$dbForm -> set_label("EmployeeID", "Employee ID");
$dbForm -> set_label("LastName", "Last Name");
$dbForm -> set_label("FirstName", "First Name");
$dbForm -> set_label("BirthDay", "DOB");
$dbForm -> set_hide("Extension");
$dbForm -> set_hide("hireDate");
$dbForm -> set_placeholder('Title', 'official job title');
$dbForm -> add_group_header("EmployeeID", "Basic Info");
$dbForm -> add_group_header("Email", "Contact Info");
$dbForm -> add_tooltip("BirthDate", "Enter employee birth date"); // tooltip supports HTML as well
$dbForm -> display();
$dbForm -> set_label("EmployeeID", "Employee ID");
$dbForm -> set_label("LastName", "Last Name");
$dbForm -> set_label("FirstName", "First Name");
$dbForm -> set_label("BirthDay", "DOB");
$dbForm -> set_hide("Extension");
$dbForm -> set_hide("hireDate");
$dbForm -> set_placeholder('Title', 'official job title');
$dbForm -> add_group_header("EmployeeID", "Basic Info");
$dbForm -> add_group_header("Email", "Contact Info");
$dbForm -> add_tooltip("BirthDate", "Enter employee birth date"); // tooltip supports HTML as well
$dbForm -> display();