expm1

Function • Params and return types changed in PHP 8.0

Returns exp($num) - 1, computed in a way that is accurate even when the value of number is close to zero.

PHP 5

PHP 7

Improved

PHP 8.1

PHP 8.2-8.3

PHP 8.4

PHP 8.5

PHP 8.6

`expm1` Function synopsis

expm1(float $num): float

Parameters

`$num`

Typefloat

The argument to process

Return value

Typefloat

e to the power of $num, minus one.

Changes to the `expm1` Function

PHP 8.0

Return type added: float
Parameter name of parameter #1 changed: $number to $num
Parameter type added for parameter #1 ($num): float

- expm1($number)
+ expm1(float $num): float

`expm1` Function Availability

PHP Version	Availability
PHP 8.6Upcoming Release	Yes
PHP 8.5Supported (Latest)	Yes
PHP 8.4Supported	Yes
PHP 8.3Security-Fixes Only	Yes
PHP 8.2Security-Fixes Only	Yes
PHP 8.1Unsupported	Yes
PHP 8.0Unsupported	Yes
PHP 7.4Unsupported	Yes
PHP 7.3Unsupported	Yes
PHP 7.2Unsupported	Yes
PHP 7.1Unsupported	Yes
PHP 7.0Unsupported	Yes
PHP 5.6Unsupported	Yes
PHP 5.5Unsupported	Yes
PHP 5.4Unsupported	Yes
PHP 5.3Unsupported	Yes