php man page for is_finite

IS_FINITE(3)								 1							      IS_FINITE(3)

is_finite - Finds whether a value is a legal finite number

SYNOPSIS
       bool is_finite (float  $val)

DESCRIPTION
	Checks whether $val is a legal finite on this platform.

PARAMETERS
	      o $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(3), is_nan(3).

PHP Documentation Group 													      IS_FINITE(3)