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PHP acosh() Function

PHP acosh() function is used to find the inverse hyperbolic cosine value of a given input number passed to it as an argument. It only accepts a single parameter $number, which is the number whose inverse hyperbolic cosine value to be found. The value of this $number parameter must be in radians unit. It returns a floating point number as output which is the inverse hyperbolic cosine value of the input number passed to it.

Syntax:

  acosh($number);

Parameter Values

Parameter	Description
number	This is a required parameter. This parameter defines the given input number.

Here is an example of acosh() Function in PHP:

<html>
<body>

<?php

echo acosh(9)."<br>";
echo acosh(34)."<br>";

?>

</body>
</html>

Output:
2.8872709503576
4.2192913720121

Here is an another example of acosh() Function in PHP:

<html>
<body>

<?php

echo acosh(-7)."<br>";  // negative value is not accepted
echo acosh(7)."<br>";
echo acosh(4.5);

?>

</body>
</html>

Output:
NAN
2.6339157938496
2.1846437916051

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