The log()
The log() function returns the natural logarithm (base E) of a number.

Syntax
log(x,base)
Example
In the following example we will use the log() function on different numbers:

<?php
echo(log(2.7183) . "<br />");
echo(log(2) . "<br />");
echo(log(1) . "<br />");
echo(log(0) . "<br />");
echo(log(-1))
?>

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Sureshbabu Harikrishnan
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