PHP atanh()用法及代碼示例

atan() 函數是預定義的 PHP 函數，用於求解三角函數。它返回一個數的反雙曲正切值。

用法:

atanh(number);

參數	描述	必需/可選
number	指定一個數字	Required

<?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));
?>

輸出：

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

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

輸出：

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

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

輸出：

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

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

輸出：

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

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

輸出：

passing negative value:-1

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