sinh() function in PHP

The sinh() function returns the hyperbolic sine of a number, which is mathematically equivalent to (exp(num) - exp(-num))/2. This function is commonly used in mathematical calculations involving hyperbolic trigonometry.

Syntax

sinh(num)

Parameters

• num − The number for which you want to calculate the hyperbolic sine. The value should be in radians.

Return Value

The sinh() function returns a float representing the hyperbolic sine of the given number.

Example 1

Basic usage with simple numeric values ?

<?php
    echo sinh(0) . "<br>";
    echo sinh(1) . "<br>";
    echo sinh(-1);
?>

0
1.1752011936438
-1.1752011936438

Example 2

Using mathematical constants with the sinh() function ?

<?php
    echo sinh(M_PI) . "<br>";
    echo sinh(M_PI_2) . "<br>";
    echo sinh(M_E);
?>

11.548739357258
2.3012989023073
7.5441371028169

Key Points

• The sinh() function accepts both positive and negative numbers

• For negative inputs, the result is also negative (odd function property)

• The function returns a float value

• Input values are treated as radians, not degrees

Conclusion

The sinh() function is essential for hyperbolic trigonometric calculations in PHP. It follows standard mathematical conventions and can handle both positive and negative input values effectively.