PHP log() Function: Natural Logarithm with Optional Base
The PHP log() function computes the natural logarithm of a number or, when a base is supplied, the logarithm with that base, and the article explains its signature, parameters, return value, and provides example code with expected output.
The PHP log() function returns the natural logarithm of a given number, or the logarithm with an optional base if the base argument is provided.
Signature: float log(float $arg [, float $base = M_E])
Parameters:
arg : the value whose logarithm is to be calculated.
base (optional): the logarithmic base; defaults to the mathematical constant e, yielding the natural logarithm.
Return value: the logarithm of arg with respect to base , or the natural logarithm if base is omitted.
Example usage:
";
echo log(2)."
";
echo log(1)."
";
echo log(0);
?>Resulting output:
1.000006684914
0.69314718055995
0
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