log() function in PHP

The log() function Returns the natural logarithm of a number.

Syntax

log(num, base)

Parameters

• num − The value for which you want to calculate the logarithm

• base − The logarithmic base

Return

The log() function Returns the natural logarithm of a number.

Example

 Live Demo

<?php    echo(log(1)); ?>

Output

0

Example

Let us see another example −

 Live Demo

<?php    echo(log(0)); ?>

Output

-INF

Example

Let us see another example −

 Live Demo

<?php    echo(log(10));    echo(log(2.7)); ?>

Output

2.3025850929940.99325177301028