PHP Preg-Replace more than one underscore

Question

How do I, using preg_replace, replace more than one underscore with just one underscore?

Answer 1

This will Accept Only Characters,numeric value or Special Character found it will replace with _
");
    PRINT_R($_REQUEST);
    $str=$_REQUEST[str];
    $str=preg_replace('/[^A-Za-z\-]/', '_', $str);
    echo strtolower(preg_replace('/_{2,}/','_',$str));
}
?>