acosh
(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
acosh — 反双曲余弦
说明
acosh(float
$arg): float
返回 arg 的反双曲余弦值，即，其双曲余弦为
arg 的那个值。
参数
-
arg -
要处理的值
返回值
The inverse hyperbolic cosine of arg
更新日志
| 版本 | 说明 |
|---|---|
| 5.3.0 | This function is now available on all platforms |
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User Contributed Notes 1 note
rahmatjon at gmail dot com ¶
1 year ago
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/>";
?>