acosh
(PHP 4 >= 4.1.0, PHP 5)
acosh — Inverse hyperbolic cosine
Description
float acosh
( float
$arg
)
Returns the inverse hyperbolic cosine of
arg, i.e. the value whose
hyperbolic cosine is arg.
Parameters
-
arg -
The value to process
Return Values
The inverse hyperbolic cosine of arg
Changelog
| Version | Description |
|---|---|
| 5.3.0 | This function is now available on all platforms |
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Коментарии
Hello!
There is no any example for acosh() function. Please put this one below the acosh() function's description.
Thank you!
Example:
<?php
$x = 1;
$y1 = acosh($x);
echo "PHP function acosh(). acosh(" . $x . ") = " . $y1 . ".<br/>";
$y2 = log($x + sqrt($x*$x -1));
echo "By definition of acosh. acosh(" . $x . ") = " . $y2 . ".<br/>";
$x = 10;
$y1 = acosh($x);
echo "PHP function acosh(). acosh(" . $x . ") = " . $y1 . ".<br/>";
$y2 = log($x + sqrt($x*$x -1));
echo "By definition of acosh. acosh(" . $x . ") = " . $y2 . ".<br/>";
?>