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PHP atan()用法及代碼示例

PHP atan() 函數用於解決三角函數問題。它將 arg 的反正切作為 Pi/2 和 pi/2 弧度之間的數值返回。

用法:

atan(arg);
參數 描述 必需/可選
arg 指定要處理的參數。 Required

例子1

<?php
$num=(0.5);
echo "Passing number is:".$num;
echo "<br>"."By using 'atan()' function your number is:".(atan($num));
?>

輸出：

Passing number is:0.5
By using 'atan()' function your number is:0.46364760900081

例子2

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

輸出：

Passing number is:-0.5
By using 'atan()' function your number is:-0.46364760900081

例子3

<?php
$num=5;
echo "Your passing number is:".$num;
echo "<br>"."By using 'atan()' function your number is:".(atan($num));
?>

輸出：

Your passing number is:5
By using 'atan()' function your number is:1.373400766945

示例 4

<?php
$num=(-5);
echo "Your passing number is:".$num;
echo "<br>"."By using 'atan()' function your number is:".(atan($num));
?>

輸出：

Your passing number is:-5
By using 'atan()' function your number is:-1.373400766945

例 5

<?php
$num=200;
echo "Your passing number is:".$num;
echo "<br>"."By using 'atan()' function your number is:".(atan($num));
?>

輸出：

Your passing number is:200
By using 'atan()' function your number is:1.5657963684609

例 6

<?php
$num=-200;
echo "Your passing number is:".$num;
echo "<br>"."By using 'atan()' function your number is:".(atan($num));
?>

輸出：

Your passing number is:-200
By using 'atan()' function your number is:-1.5657963684609

例 7

<?php
$num=(3*pi()/2);
echo "passing number (3*pi()/2) is:".$num;
echo "<br>"."By using 'atan()' function your number is:".(atan($num));
?>

輸出：

passing number (3*pi()/2) is:4.7123889803847
By using 'atan()' function your number is:1.3616916829712






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