log
(PHP 4, PHP 5, PHP 7, PHP 8)
log — Natural logarithm
Description
log(float
$num, float $base = M_E): float
If the optional base parameter is specified,
log() returns logbase
num, otherwise log()
returns the natural logarithm of num.
Parameters
-
num -
The value to calculate the logarithm for
-
base -
The optional logarithmic base to use (defaults to 'e' and so to the natural logarithm).
Return Values
The logarithm of num to
base, if given, or the
natural logarithm.
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