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Editorial Team
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Asked: 2026-06-15T04:20:59+00:00

I am typing a simple codes in PHP and HTML. How can I display

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I am typing a simple codes in PHP and HTML. How can I display the result in same page of browser not in another window tab or page?

Following is the simple HTML formula code:

To add two numbers and display on the same page

<html>
<head>
    <title> Sum of two numbers </title>
<body>

    <form action="sum.php" method="POST">
    First Number:  <input type="Text" Name="Num1"><br>
    Second Number: <input type="Text" Name="Num2"><p>
    <input type="Submit" value="Calculate">
    </form>

</body>
</html>

and sum.php file is as follows.

<?php
// add First and Second Numbers
$sum = $_POST["Num1"] + $_POST["Num2"];
// their sum is diplayed as
echo "The sum of  First Number (".$_POST["Num1"].") and
Second Number  (".$_POST["Num2"].") is $sum";
?>
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1 Answer

  1. Editorial Team
    <html>
<head>
    <title> Sum of two numbers </title>
<body>

    <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
    First Number:  <input type="Text" Name="Num1"><br>
    Second Number: <input type="Text" Name="Num2"><p>
    <input type="Submit" value="Calculate">
    </form>

<?php
if (count($_POST) > 0 && isset($_POST["Num1"]) && isset($_POST["Num2"])){
    // add First and Second Numbers
    $sum = $_POST["Num1"] + $_POST["Num2"];
    // their sum is diplayed as
    echo "The sum of  First Number (".$_POST["Num1"].") and
    Second Number  (".$_POST["Num2"].") is $sum";
}
?>
</body>
</html>
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