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

参见

User Contributed Notes

rahmatjon at gmail dot com 16-Jan-2021 02:35
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/>";
?>
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