PHP 8.1.15 Released!

acosh

(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

acosh反双曲余弦

说明

acosh(float $num): float

返回 num 的反双曲余弦值,即其双曲余弦为 num 的那个值。

参数

num

要处理的值

返回值

num 反双曲余弦

参见

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User Contributed Notes 1 note

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rahmatjon at gmail dot com
2 years 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/>";
?>
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