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PHP atanh() Function

< PHP Math Reference

Example

Return the inverse hyperbolic tangent of different numbers:

<?php
echo(atanh(M_PI_4) . "<br>");
echo(atanh(0.50) . "<br>");
echo(atanh(-0.50) . "<br>");
echo(atanh(1) . "<br>");
echo(atanh(-1));
?>

Definition and Usage

The atanh() function returns the inverse hyperbolic tangent of a number.

Syntax

atanh(number);

Parameter	Description
number	Required. Specifies a number

Technical Details

Return Value:	The hyperbolic tangent of number
Return Type:	Float
PHP Version:	4.1+
PHP Changelog:	PHP 5.3: This function is now available on all platforms

< PHP Math Reference