Math function atanh() to return inverse hyperbolic tangent of a input in PHP

Calculate inverse hyperbolic tangent

atanh() returns the inverse hyperbolic tangent. For a finite real result, the input should be greater than -1 and less than 1.

$value = atanh(0.5);
echo $value;

The examples below build from the basic call to practical variations and edge cases.

<?Php
echo atanh(5); // Output NAN
echo "<br>";
echo atanh(1.5); // Output NAN
echo "<br>";
echo atanh(1); // Output INF
echo "<br>";
echo atanh(0.9); // Output 1.4722194895832
echo "<br>";
echo atanh(0); // Output 0
echo "<br>";
echo atanh(-0.5); // Output -0.54930614433405
echo "<br>";
echo atanh(-1); // Output -INF
echo "<br>";
echo atanh(-1.5); // Output NAN
echo "<br>";
echo atanh(-2.4); // Output NAN
?>

atanh(float $num): float;

For a finite real result, the input must be greater than -1 and less than 1. Inputs of ±1 produce infinite values; inputs outside that interval produce NAN.

DEMO of atanh()

Questions

What does the `atanh()` function in PHP do?
What is the purpose of the `atanh()` function in PHP?
How is the `atanh()` function used to calculate the inverse hyperbolic tangent of a number?
What is the range of values returned by the `atanh()` function in PHP?
Can the `atanh()` function be used with both positive and negative numbers?
What happens if you pass an invalid argument to the `atanh()` function?
How can you use the `atanh()` function to calculate the hyperbolic tangent given the value of the inverse hyperbolic tangent?
Are there any alternative ways to calculate the inverse hyperbolic tangent in PHP besides using the `atanh()` function?
Can the `atanh()` function return a complex number?
What type of value does the `atanh()` function return: integer, float, or something else?

TANH() function
Math Functions

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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atanh():inverse hyperbolic tangent

Calculate inverse hyperbolic tangent

DEMO of atanh()

Questions

Subhendu Mohapatra