PHP cos()用法及代碼示例

cos() 函數是預定義的 PHP 函數。它用於返回數字的餘弦。它返回一個介於 -1 和 1 之間的數值，表示角度的餘弦。

用法:

cos(number);

參數	描述	必需/可選
number	指定一個數字	Required

<?php
$num=3;
echo "Your number is:".$num;
echo "<br>"."By using 'cos()' function your number is:".(cos($num));
?>

輸出：

Your number is:3
By using 'cos()' function your number is:-0.98999249660045

<?php
$num=(-3);
echo "Your number is:".$num;
echo "<br>"."By using 'cos()' function your number is:".(cos($num));
?>

輸出：

Your number is:-3
By using 'cos()' function your number is:-0.98999249660045

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

輸出：

Your number is:0
By using 'cos()' function your number is:1

<?php
echo "Your number is:M_PI";
echo "<br>"."By using 'cos()' function your number is:".(cos(M_PI));
?>

輸出：

Your number is:M_PI
By using 'cos()' function your number is:-1

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

輸出：

Your number is 2*M_PI:6.2831853071796
By using 'cos()' function your number is:1

相關用法

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