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PHP asin()用法及代碼示例

asin() 函數是預定義的三角函數 PHP 函數。它用於計算三角學問題。它返回一個介於 -1 和 1 之間的數字的反正弦。

用法:

asin($value)
參數 描述 必需/可選
number 指定一個介於 -1 到 1 之間的數字 Required

注意：asin(1) 返回 Pi/2 的值。

示例 1

<?php
$num=0 ;
echo "Your number is:".$num;
echo "<br>"."By using 'asin()' function your number is:".(asin($num));
?>

輸出：

Your number is:0
By using 'asin()' function your number is:0

例2

<?php
$num=1;
echo "Your number is:".$num;
echo "<br>"."By using 'asin()' function your number is:".(asin($num));
?>

輸出：

Your number is:1
By using 'asin()' function your number is:1.5707963267949

例3

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

輸出：

Your number is:-1
By using 'asin()' function your number is:-1.5707963267949

例4

<?php
$num=(-0.4);
echo "Your number is:".$num;
echo "<br>"."By using 'asin()' function your number is:".(asin($num));
?>

輸出：

Your number is:-0.4
By using 'asin()' function your number is:-0.41151684606749

例5

<?php
$num=(0.64);
echo "Your number is:".$num;
echo "<br>"."By using 'asin()' function your number is:".(asin($num));
?>

輸出：

Your number is:0.64
By using 'asin()' function your number is:0.69449826562656

例6

<?php
$num=2;
echo "Your number is:".$num;
echo "<br>"."By using 'asin()' function your number is:".(asin($num));
?>

輸出：

Your number is:2
By using 'asin()' function your number is:NAN






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