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PHP Quiz PHP CertificatePHP expm1() Function
Complete PHP Math Reference
Definition and Usage
The expm1() function returns the value of Ex-1, where E is Euler's constant (approximately 2.7183) and x is the number passed to it.
Syntax
expm1(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).
Note: This function is not implemented on Windows platforms.
Example
In the following example we will use the expm1() function on different numbers:
<?php
echo(expm1(1) . "<br />");
echo(expm1(-1) . "<br />");
echo(expm1(5) . "<br />");
echo(expm1(10))
?>
echo(expm1(1) . "<br />");
echo(expm1(-1) . "<br />");
echo(expm1(5) . "<br />");
echo(expm1(10))
?>
Complete PHP Math Reference
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