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# exp

(PHP 3, PHP 4 , PHP 5)

exp -- Calculates the exponent of `e` (the Neperian or Natural logarithm base)

## Description

float exp ( float arg)

Returns `e` raised to the power of arg.

> 備注: 'e' is the base of the natural system of logarithms, or approximately 2.718282.

示範 1.exp() example
`<?php echo exp(12) . "\n"; echo exp(5.7); ?>`
The above example will output:
    1.6275E+005
    298.87

See also log() and pow().

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