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    PHP expm1() Function

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    PHP expm1() Function

    PHP expm1() function is used to calculate e raised to the power of the given input argument minus one (ex-1). It takes a single parameter $power which is the power e has to be raised to. It returns a floating point value as output which is the value of e raised to the power of the given $power argument -1.

    Syntax:

      expm1($power);

    Parameter Values

    Parameter Description
    power This is a required parameter. This parameter defines the given exponent value.

    Here is an example of expm1() function in PHP:

    <html>
<body>

<?php

echo "Value of (e1) : ".exp(1)."<br>";
echo "Value of (e1-1) : ".expm1(1)."<br>";
echo "Value of (e2) : ".exp(2)."<br>";
echo "Value of (e2-1) : ".expm1(2)."<br>";

?>

</body>
</html>
    Output:
    Value of (e1) :  2.718281828459
    Value of (e1-1) :  1.718281828459
    Value of (e2) :  7.3890560989307
    Value of (e2-1) :  6.3890560989307

    Here is an another example of expm1() function in PHP:

    <html>
<body>

<?php

echo expm1(0)."<br>";
echo expm1(1)."<br>";
echo expm1(5)."<br>";
echo expm1(8.5)."<br>";
echo expm1(21)."<br>";
echo expm1(25.5)."<br>";

?>

</body>
</html>
    Output:
    0
    1.718281828459
    147.41315910258
    4913.7688402991
    1318815733.4832
    118716009131.17
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    PHP Math Functions
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