pow Exponential expression numberpow numberbase numberexp Returns base raised to the power of exp. If possible, this function will return an integer. If the power cannot be computed, a warning will be issued, and pow will return &false;. Since PHP 4.2.0 pow doesn't issue any warning. PHP cannot handle negative bases. ]]> In PHP 4.0.6 and earlier pow always returned a float, and did not issue warnings. See also: exp, sqrt, bcpow, and gmp_pow,