log10
log
Math Functions
PHP Manual

# log1p

(PHP 4 >= 4.0.7, PHP 5)

log1p — Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero

### Description

float log1p ( float `$number` )
Warning

This function is EXPERIMENTAL. The behaviour of this function, the its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.

log1p() returns log(1 + `number` ) computed in a way that is accurante even when the value of `number` is close to zero. log() might only return log(1) in this case due to lack of precision.

> Note: This function is not implemented on Windows platforms.

### Parameters

`number`

  The argument to process

### Return Values

log(1 + `number` )

### See Also

- expm1()
- log()
- log10()

log10
log
Math Functions
PHP Manual