is_nan
(PHP 4 >= 4.2.0)
is_nan -- Finds whether a value is not a number
Description
bool is_nan ( float val)
Returns TRUE if val is 'not a number', like the result of
acos(1.01).
See also is_finite() and is_infinite().
lcg_value
(PHP 4 )
lcg_value -- Combined linear congruential generator
Description
float lcg_value ( void )
lcg_value() returns a pseudo random number in the range
of (0, 1). The function combines two CGs with periods of
2^31 - 85 and 2^31 - 249. The period of this function is
equal to the product of both primes.
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