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PHP acosh() Function
Definition and Usage
The acosh() function returns the inverse hyperbolic cosine ratio of given angle in of given parameter. In other words, the return value of asinh() is hyperbolic sine of given parameter. A hyperbolic inverse hyperbolic cosine function is defined as −.
acosh(x) = log(x+sqrt(pow(x,2)-1))
This function returns a float value.
Syntax
acosh ( float $arg ) : float
Parameters
| Sr.No | Parameter & Description |
|---|---|
| 1 | arg A floating point value whose inverse hyperbolic cosine is to be calculated |
Return Values
PHP acosh() function returns inverse hyperbolic cosine 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 acosh(pi/2) and returns 1.0232274785476 which is also the result of formula definition −
<?php
$arg=M_PI_2;
$val=acosh($arg);
$ret=log($arg+sqrt(pow($arg,2)-1));
echo "acosh(" . $arg . ") = " . $val . "
";
echo "using formula = " . $ret;
?>Output
This will produce the following result −
acosh(1.5707963267949) = 1.0232274785476 using formula = 1.0232274785476
Example
The following example uses deg2rad() function to convert degrees to radians and then uses acosh(60). Result is 0.30604210861327 −
<?php
$arg=deg2rad(60);
$val=acosh($arg);
echo "acosh(" . $arg . ") = " . $val;
?>Output
This will produce the following result −
acosh(1.0471975511966) = 0.30604210861327
Example
Let's check find out acosh(0). It returns NAN −
<?php
$arg=0;
$val=acosh($arg);
echo "acosh(" . $arg . ") = " . $val;
?>Output
This will produce the following result −
acosh(0) = NAN
Example
Following example computes cosh(pi)
<?php
$arg=M_PI;
$val=acosh($arg);
echo "acosh(" . $arg . ") = " . $val;
?>Output
This will produce the following result −
acosh(3.1415926535898) = 1.8115262724609
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