PHP Log () Function

Definition: The Log () PHP Function is used to find logarithm. You can find either natural logarithm (using the base of e - which is approximately 2.71) or a logarithm of a specified base. If you specify a base you are really just doing log_b(n) = log(n)/log(b). It is written as log(argument, base) so if you wanted to find the log₂(8) you would write it as log(8,2).

Also Known As: Logarithm

Examples:

<?php
echo(log(8,2) . "<br />");
echo(log(8) . "<br />");
echo(log(2) . "<br />");
echo(log(8)/log(2) . "<br />");
?>

This would return the results:
3
2.0794415416798
0.69314718055995
3