hypot
is_infinite
Math Functions
PHP Manual

# is_finite

(PHP 4 >= 4.2.0, PHP 5)

is_finite — Finds whether a value is a legal finite number

### Description

bool is_finite ( float `$val` )

Checks whether `val` is a legal finite on this platform.

### Parameters

`val`

  The value to check

### Return Values

`TRUE` if `val` is a legal finite number within the allowed range for a PHP float on this platform, else `FALSE`.

### See Also

- is_infinite() - Finds whether a value is infinite
- is_nan() - Finds whether a value is not a number

hypot
is_infinite
Math Functions
PHP Manual