PHP sinh() Function

Definition and Usage

The sinh() function calculates hyperbolic sine of given angle in radians. A hyperbolic sine function is defined as

sinh(x) = (e^x – e^-x))/2

This function returns a float value between Π and -Π.

Syntax

sinh( float $arg ) : float

Parameters

Return Values

PHP sinh() function returns hyperbolic sine ratio of given parameter.

PHP Version

This function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.

Example

Following example calculates sinh(pi/2) and returns 2.3012989023073 which is also the result of formula (e^x – e^-x))/2−

<?php
   $arg=M_PI_2;
   $val=(exp($arg)-exp(-$arg))/2;
   $res=sinh($arg);
   echo "sinh(M_PI_2) = " . $val. "\n";
   echo "using formula = " . $res . "\n";
?>

Output

This will produce following result −

sinh(M_PI_2) = 2.3012989023073
using formula = 2.3012989023073

Example

Following example uses deg2rad() function to convert degrees to radians and then uses sinh(30) −

<?php
   $arg=deg2rad(30);
   $val=sinh($arg);
   echo "sinh(" . $arg . ") = " . $val;
?>

Output

This will produce following result −

sinh(0.5235987755983) = 0.54785347388804

Example

Let's check find out sinh(0). It returns 0 −

<?php
   $arg=0;
   $val=sinh($arg);
   echo "sinh(" . $arg . ") = " . $val;
?>

Output

This will produce following result −

sinh(0) = 0

Example

Following example computes sinh(pi)

<?php
   $arg=M_PI; // pi
   $val=sinh($arg);
   echo "sinh(" . $arg . ") = " . $val;
?>

Output

This will produce following result −

sinh(3.1415926535898) = 11.548739357258