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Taking Logarithms in PHP
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Taking Logarithms in PHP

InfinityCoder November 16, 2016

You want to take the logarithm of a number.

For logs using base e (natural log), use log():

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2
// $log is about 2.30258
$log = log(10);

For logs using base 10, use log10():

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// $log10 == 1
$log10 = log10(10);

For logs using other bases, pass the base as the second argument to log():

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// log base 2 of 10 is about 3.32
$log2 = log(10, 2);

Both log() and log10() are defined only for numbers that are greater than zero. If you pass in a number equal to or less than zero, they return NAN, which stands for not a number.

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