PHP 8.0.6 Released!

acosh

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

acoshInverse hyperbolic cosine

Description

acosh ( float $num ) : float

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

Parameters

num

The value to process

Return Values

The inverse hyperbolic cosine of num

See Also

add a note add a note

User Contributed Notes 1 note

up
0
rahmatjon at gmail dot com
3 months 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/>";
?>
To Top