PHP tanh() Function
The PHP tanh() function returns hyperbolic tangent of a value. The hyperbolic tangent of x is defined as:
where e is an Euler's number.
In special cases it returns the following:
- If the argument is NAN, then the result is NAN.
- If the argument is positive infinity, then the result is +1.0.
- If the argument is negative infinity, then the result is -1.0.
Syntax
tanh(number)
Parameters
number |
Required. Specify the value. |
Return Value
Returns the hyperbolic tangent of a value.
Example:
In the example below, tanh() function is used to find out the hyperbolic tangent of a value.
<?php echo "tanh(-2) = ".tanh(-2)."\n"; echo "tanh(-1) = ".tanh(-1)."\n"; echo "tanh(0) = ".tanh(0)."\n"; echo "tanh(1) = ".tanh(1)."\n"; echo "tanh(2) = ".tanh(2)."\n"; echo "tanh(INF) = ".tanh(INF)."\n"; echo "tanh(-INF) = ".tanh(-INF)."\n"; echo "tanh(NAN) = ".tanh(NAN)."\n"; ?>
The output of the above code will be:
tanh(-2) = -0.96402758007582 tanh(-1) = -0.76159415595576 tanh(0) = 0 tanh(1) = 0.76159415595576 tanh(2) = 0.96402758007582 tanh(INF) = 1 tanh(-INF) = -1 tanh(NAN) = NAN
❮ PHP Math Reference