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PHP atanh () function

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Examples

Returns the number of different inverse hyperbolic tangent:

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

Running instance »

Definition and Usage

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


grammar

atanh( number );

参数 描述
number 必需。规定一个数。

technical details

return value: number inverse hyperbolic tangent.
Return type: Float
PHP version: 4.1+
PHP Update Log: PHP 5.3: This function is available on all platforms.


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