log
log
(PHP 4, PHP 5, PHP 7)
log — Natural logarithm
Description
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.
Parameters
arg
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 arg to base, if given, or the natural logarithm.
See Also
- log10() - Base-10 logarithm
- exp() - Calculates the exponent of e
- pow() - Exponential expression
← log1p
max →
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