| public static assertNumber ( integer | float $number ) | ||
| $number | integer | float | |
public static function assertNumber($number)
{
if (!is_numeric($number)) {
throw new \InvalidArgumentException("Argument is not a number");
}
} /**
* @return mixed|callable
*/
public static function subtract()
{
$args = func_get_args();
/**
* Subtracts two numbers. Equivalent to `a - b` but curried.
*
* @category Math
*
* @param int|float $a The first value.
* @param int|float $b The second value.
*
* @return Number The result of `$a - $b`.
*/
$_subtract = function ($a, $b) {
Exception::assertNumber($a);
Exception::assertNumber($b);
return $a - $b;
};
return call_user_func_array(self::curry2($_subtract), $args);
}