PHP log1p() Function
Example
Return log(1+number) for different numbers:
<?php
echo(log1p(2.7183) . "<br>");
echo(log1p(2) . "<br>");
echo(log1p(1) . "<br>");
echo(log1p(0));
?>
Run example »
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.
Syntax
log1p(number);
| Parameter | Description |
|---|---|
| number | Required. Specifies the number to process |
Technical Details
| 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 |
❮ PHP Math Reference
