PHP exp() function

The exp() function is used to calculate the exponent of e. It returns e raised to the power of x (ex) where 'e' is the base of the natural system of logarithms and x is the number passed to it.

Syntax:

Name	Description	Return type
x	Specifies the exponent	float

Example1:

$PHP math exp function$

<?php
	$v1= 0;
	$v2=1;
	$v3=2.5;
	$res1=exp($v1);
	$res2=exp($v2);
	$res3=exp($v3);
	echo "exponent of $v1 is = $res1<br />";
	echo "exponent of $v2 is = $res2<br />";
	echo "exponent of $v3 is = $res3<br />";
?> 

Test it Now

Output:

exponent of 0 is = 1
exponent of 1 is = 2.718281828459
exponent of 2.5 is = 12.182493960703

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

Example2

<?php
 for($i=-3;$i<=3;$i++)
    echo 'The exponent value of e^'.$i.' = '.exp($i)."<br>";
 ?> 

Test it Now

Output:

The exponent value of e^-3 = 0.049787068367864
The exponent value of e^-2 = 0.13533528323661
The exponent value of e^-1 = 0.36787944117144
The exponent value of e^0 = 1
The exponent value of e^1 = 2.718281828459
The exponent value of e^2 = 7.3890560989307
The exponent value of e^3 = 20.085536923188

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