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PHP Math Functions

PHP expm1() Function

Definition and Usage

The expm1() function returns exp(x) - 1, even when the value of number is close to zero, it can also calculate accurate results.

Syntaxxexpm1(
) Parameter
x Required. A number.

Description

expm1() returns 'exp(x) - 1', even when x Values close to zero can also calculate accurate results. However, when two values approach equality, 'exp(x) - 1' becomes less accurate.

Tips and Notes

Warning:This function is experimental. The behavior of this function, including the function name and any other documentation about this function, may change without notice in future PHP releases. Use this function at your own risk.

Tip:Use 'e' as the base of the natural logarithm 2.718282.

Note:This function is not implemented on the Windows platform.

Example

In this example, we will apply the expm1() function to different numbers:

<?php
echo(expm1(1));
echo(expm1(-1));
echo(expm1(5));
echo(expm1(10))
?>

PHP Math Functions