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acos

(PHP 4, PHP 5, PHP 7, PHP 8)

acos反余弦

说明

acos(float $arg): float

返回 arg 的反余弦值,单位是弧度。acos()cos() 的反函数,它的意思是在 acos() 范围里的每个值都是 a==cos(acos(a))

参数

arg

要处理的参数

返回值

arg 的反余弦弧度。

参见

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User Contributed Notes 1 note

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rahmatjon at gmail dot com
9 months ago
Hello!
There is no any example for acos() function. Please put this one below the acos() function's description.
Thank you!

Example:
<?php
    $arg
=0.5;
   
$val=acos($arg);
    echo
"acos(" . $arg . ") = " . $val . " radians.<br/>";
    echo
"Pi value = " . pi() . "<br/>";   
    echo
"acos(" . $arg . ") = " . $val/pi()*180 . " degrees<br/>";
?>
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