CI_Utf8::is_ascii PHP Method

Tests if a string is standard 7-bit ASCII or not.

public is_ascii ( string $str ) : boolean
$str	string	String to check
return	boolean

    public function is_ascii($str)
    {
        return preg_match('/[^\\x00-\\x7F]/S', $str) === 0;
    }

CI_Utf8