PHP log1p()Function
Examples
Returns log(1+number) for different numbers:
<?php
echo(log1p(2.7183) . "<br>");
echo(log1p(2) . "<br>");
echo(log1p(1) . "<br>");
echo(log1p(0));
?>
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), even whennumberthe value is close to zero, it can calculate an accurate result.
Syntax
log1p(number);
| Parameters | 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 available on all platforms. |
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