PHP tanh() Function – Hyperbolic Tangent

The tanh() function in PHP returns the hyperbolic tangent of a given float argument, defined as sinh(arg)/cosh(arg).

Signature: float tanh(float $arg) Parameter: $arg – the value to be processed.

Return value: The hyperbolic tangent of $arg as a float.

Example usage:

<?php
echo tanh(M_PI_4)."<br>";
echo tanh(0.50)."<br>";
echo tanh(-0.50)."<br>";
echo tanh(5)."<br>";
echo tanh(10)."<br>";
echo tanh(-5)."<br>";
echo tanh(-10);
?>

The script outputs the following values respectively:

0.65579420263267
0.46211715726001
-0.46211715726001
0.9999092042626
0.99999999587769
-0.9999092042626
-0.99999999587769