PHP implements online calculator function

This article mainly introduces the simple online calculator function implemented in PHP, involving skills related to PHP numerical operations and form operations. Friends in need can refer to it

The details are as follows:

第一个操作数不能为空";
unset($_POST["sub"]);
//取消表单中的提交变量，后面计算判断时将不执行
}
if(empty($_POST["num2"])){
//如果第二个第一个操作数为空输出错误信息，并停止计算
echo "第二个操作数不能为空";
unset($_POST["sub"]);
//取消表单中的提交变量，后面计算判断时将不执行
}
$oper=$_POST["oper"];
//获取操作符号
$num1=$_POST["num1"];
//获取第一个操作数
$num2=$_POST["num2"];
//获取第二个操作数
if($oper == "/"){
if($num2 == 0){
echo "0不能作为除数使用";
unset($_POST["sub"]);
}
}
}
?>

";
}
?>

 
简单的计算器




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";
echo "计算结果:$num1 $oper $num2 = $sum";
echo "

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