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PHP exp() Function

Complete PHP Math Reference

Definition and Usage

The exp() function returns the value of E^x, where E is Euler's constant (approximately 2.7183) and x is the number passed to it.

Syntax

exp(x)

Parameter	Description
x	Required. A number

Tips and Notes

Tip: E is the Euler's constant, which is the base of natural logarithms (approximately 2.7183).

Example

In the following example we will use the exp() function on different numbers:

<?php
echo(exp(1) . "<br />");
echo(exp(-1) . "<br />");
echo(exp(5) . "<br />");
echo(exp(10))
?>

The output of the code above will be:

2.718281828459045
0.36787944117144233
148.4131591025766
22026.465794806718