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What is tanh() in PHP?

Harris Amjad

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

The tanh() function in PHP returns a number’s hyperbolic tangent in radians.

The following illustration shows the mathematical representation of the tanh() function.

Figure 1: Mathematical representation of the hyperbolic tangent function

Syntax

tanh(float $num): float

Parameter

This function requires a number that represents an angle in radians as a parameter.

To convert degrees to radians, use:

radians = degrees * ( M_PI / 180.0 )

Return value

tanh() returns the hyperbolic tangent of the number that is sent in as a parameter in radians.

If the value of num is NaNnot a number, then the returned value is NaN.

Code

<?php
#Positive number in radians
echo("tanh(2.3): ");
echo (tanh(2.3));
?>
<?php
#Negative number in radians
echo("tanh(-2.3): ");
echo (tanh(-2.3));
?>
<?php
#converting the degrees angle into radians and then applying tanh()
#degrees = 45
echo("tanh(45 * (M_PI / (180))): ");
echo (tanh(45 * (M_PI / (180))));
?>

RELATED TAGS

php
math
tanh
communitycreator

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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