PHP atanh() 函数

atanh() 函数是预定义的 PHP 函数，用于解决三角函数问题。它返回一个数的反双曲正切值。

语法

atanh(number);

示例1

<?php
num=(M_PI_4);
echo "Your passing number (M_PI_4) is: ".num;
echo "<br>"."By using 'atanh()' function your number is :".(atanh($num));
?> 

输出：

Your passing number (M_PI_4) is: 0.78539816339745
By using 'atanh()' function your number is :1.0593061708232

示例2

<?php
num=(0.50);
echo "Your passing number is: ".num;
echo "<br>"."By using 'atanh()' function your number is :".(atanh($num));
?>

输出：

Your passing number is: 0.5
By using 'atanh()' function your number is :0.54930614433405

示例3

<?php
num=(-0.50);
echo "passing negative value: ".num;
echo "<br>"."By using 'atanh()' function your number is :".(atanh($num));
?>

输出：

passing negative value: -0.5
By using 'atanh()' function your number is :-0.54930614433405

示例4

<?php
num=1;
echo "passing positive value: ".num;
echo "<br>"."By using 'atanh()' function your number is :".(atanh($num));
?>

输出:

passing negative value: 1
By using 'atanh()' function your number is :INF

示例5

<?php
num=(-1);
echo "passing negative value: ".num;
echo "<br>"."By using 'atanh()' function your number is :".(atanh($num));
?>

输出：

passing negative value: -1