Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8
Finds whether the type of a variable is float
Alias is_double
is_float(mixed $value): bool
                    case null === $v:

                    case 
\is_bool($v):

                    case 
\is_int($v):

                    case 
\is_float($v):

                        continue 
2;

                    case 
\is_string($v):

                        if (
'' === $v) {