數值變數交換常用方法

echo "\n---臨時變數法---\n";

$num1 = 3;
$num2 = 6;
echo "交換前：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
$tmp = $num1;
$num1 = $num2;
$num2 = $tmp;
echo "交換後：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
/*---臨時變數法---
交換前：
$num1 = 3
$num2 = 6
交換後：
$num1 = 6
$num2 = 3
*/

echo "\n---加減法---\n";

$num1 = 3;
$num2 = 6;
echo "交換前：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
$num1 = $num1 + $num2;
$num2 = $num1 - $num2;
$num1 = $num1 - $num2;
echo "交換後：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
/*---加減法---
交換前：
$num1 = 3
$num2 = 6
交換後：
$num1 = 6
$num2 = 3
*/

echo "\n---異或法---\n";

$num1 = 3;
$num2 = 6;
echo "交換前：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
$num1 = $num1 ^ $num2;
$num2 = $num1 ^ $num2;
$num1 = $num1 ^ $num2;
echo "交換後：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
/*---異或法---
交換前：
$num1 = 3
$num2 = 6
交換後：
$num1 = 6
$num2 = 3
*/

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