PHP log() Function
Example
Return the natural logarithm of different numbers:
<?php
echo(log(2.7183) . "<br>");
echo(log(2) . "<br>");
echo(log(1) . "<br>");
echo(log(0);
?>
Run example »
echo(log(2.7183) . "<br>");
echo(log(2) . "<br>");
echo(log(1) . "<br>");
echo(log(0);
?>
Definition and Usage
The log() function returns the natural logarithm of a number, or the logarithm of number to base.
Syntax
log(number,base);
| Parameter | Description |
|---|---|
| number | Required. Specifies the value to calculate the logarithm for |
| base | Optional. The logarithmic base to use. Default is 'e' |
Technical Details
| Return Value: | The natural logarithm of a number, or the logarithm of number to base |
|---|---|
| Return Type: | Float |
| PHP Version: | 4+ |
| PHP Changelog: | PHP 4.3: The base parameter were added |
PHP Math Reference
