PHPerKaigi 2021

acosh

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

acoshInverse hyperbolic cosine

Descrierea

acosh ( float $num ) : float

Returns the inverse hyperbolic cosine of num, i.e. the value whose hyperbolic cosine is num.

Parametri

num

The value to process

Valorile întoarse

The inverse hyperbolic cosine of num

A se vedea și

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User Contributed Notes 1 note

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rahmatjon at gmail dot com
1 month 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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