The log() function returns the natural logarithm of a number, or the logarithm of number to base.
float log ( float $arg [, float $base = M_E ] )
If the optional base parameter is specified, log() returns logbase arg, otherwise log() returns the natural logarithm of arg.
Parameter | Description |
---|---|
arg | The value to calculate the logarithm for |
base | The optional logarithmic base to use (defaults to 'e' and so to the natural logarithm). |
The logarithm of arg to base, if given, or the natural logarithm.