What is sinh() in PHP?

The sinh() function returns the hyperbolic sine of a number in radians.

The illustration below shows the mathematical representation of the sinh() function.

Mathematical representation of the hyperbolic sine function

Syntax

sinh(float $num): float

Parameter

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

The following formula is used to convert degrees to radians.

radians = degrees * ( M_PI / 180.0 )

Return value

sinh() returns a number’s hyperbolic sine (in radians), which is sent as a parameter.

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

  • If the value of num is positive infinity, then the value returned is positive infinity.

  • If the value of num is negative infinity, then the value returned is negative infinity.

Code

<?php
#Positive number in radians
echo ("sinh(2.3): ");
echo (sinh(2.3));
?>	
<?php
#Negative number in radians
echo ("sinh(-2.3): ");
echo (sinh(-2.3));
echo ("\n");
?>
<?php
#converting the degrees angle into radians and then applying sinh()
#degrees = 90
echo ("sinh(90 * (M_PI / (180))): ");
echo (sinh(90 * (M_PI / (180))));
?>

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