PHP log()Functions
Examples
Returns the natural logarithm of different numbers:
<?php
echo(log(2.7183) . "<br>");
echo(log(2) . "<br>");
echo(log(1) . "<br>");
echo(log(0);
?>
echo(log(2.7183) . "<br>");
echo(log(2) . "<br>");
echo(log(1) . "<br>");
echo(log(0);
?>
Run example »
Definition and Usage
The log() function returns the natural logarithm of a number, or withbaseas the basenumberthe logarithm of.
Syntax
log(number,base);
| Parameters | Description |
|---|---|
| number | Required. Specifies the value for which to calculate the logarithm. |
| base | Optional. The base of the logarithm to use. Default is 'e'. |
Technical Details
| Return value: | The natural logarithm of a number, or withbaseas the basenumberthe logarithm of. |
|---|---|
| Return type: | Float |
| PHP Version: | 4+ |
| PHP Changelog: | PHP 4.3: Added the base parameter. |
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