| Manuál PHP | ||
|---|---|---|
| PÅ™edcházejÃcà | DalÅ¡Ã | |
log
Description
float log ( float arg [, float base] )
If the optional base parameter is specified,
log() returns logbase
arg, otherwise log()
returns the natural logarithm of arg.
Poznámka: The
baseparameter became available with PHP 4.3.0.As always you can calculate the logarithm in base b of a number n, but using the mathematical identity: logb(n) = log(n)/log(b), where log is the neperian (or natural) logarithm.
See also exp().