PHP log1p() Function

Return log(1+number) for different numbers:

<?php
echo(log1p(2.7183) . "<br>");
echo(log1p(2) . "<br>");
echo(log1p(1) . "<br>");
echo(log1p(0));
?>

Definition and Usage

The log1p() function returns log(1+number), computed in a way that is accurate even when the value of number is close to zero.

log1p( number);

Parameter	Description
number	Required. Specifies the number to process

Return Value:	log(1+number)
Return Type:	Float
PHP Version:	4.1+
PHP Changelog:	PHP 5.3: The log1p() function is now available on all platforms