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log

(PHP 4, PHP 5, PHP 7)

Natural logarithm

float log ( float $arg [, float $base = M_E ] )

If the optional base parameter is specified, log() returns log_basearg, 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).

Returns:

The logarithm of arg to base, if given, or the natural logarithm.

See also:

Links:

http://php.net/manual/en/function.log.php

doc_php

2016-02-24 16:02:30

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