临时变量法echo"\n---临时变量法---\n";$num1=3;$num2=6;echo"交换前:\n",'$num1=',$num1,"\n",'$num2=',$num2,"\n";$tmp=$num1;$num1=$num2;$num2=$tmp;echo"Afterswap:\n",'$num1=',$num1,"\n",'$num2=',$num2,"\n";/*---临时变量法---交换前:$num1=3$num2=6交换后：$num1=6$num2=3*/加减法echo"\n---加减法---\n";$num1=3;$num2=6;echo"交换前：\n",'$num1=',$num1,"\n",'$num2=',$num2,"\n";$num1=$num1+$num2;$num2=$num1-$num2;$num1=$num1-$num2;echo"交换后:\n",'$num1=',$num1,"\n",'$num2=',$num2,"\n";/*---加减法---交换前：$num1=3$num2=6交换后：$num1=6$num2=3*/异或法echo"\n---异或法---\n";$num1=3;$num2=6;echo"交换前:\n",'$num1=',$num1,"\n",'$num2=',$num2,"\n";$num1=$num1^$num2;$num2=$num1^$num2;$num1=$num1^$num2;echo"交换后:\n",'$num1=',$num1,"\n",'$num2=',$num2,"\n";/*---异或法---交换前：$num1=3$num2=6交换后：$num1=6$num2=3*/
