Return log(1+number) for different numbers in PHP

Description

The following code shows how to return log(1+number) for different numbers.

Example

  //from   w  ww  .j  a  v a  2 s . c  o  m
<?php
    echo(log1p(2.7183) . "<br>");
    echo(log1p(2) . "<br>");
    echo(log1p(1) . "<br>");
    echo(log1p(0));
?>

The code above generates the following result.