Question

I know that there is the function ctype_alpha, though this one will return FALSE when the string contains spaces (white space character).

How do I allow alpha characters and spaces, but nothing else?

Answer 1

$is_alpha_space = ctype_alpha(str_replace(' ', '', $input)));

or

$is_alpha_space = preg_match('/^[a-z\s]*$/i', $input);