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Simple calculator program written in PHP

A simple calculator program written in PHP is a basic application that allows users to perform mathematical operations such as addition, subtraction, multiplication and division. The program is written in the PHP programming language, which is a popular server-side scripting language that is commonly used for web development.

The program can be designed to have a user interface that allows users to input the mathematical operation they wish to perform and the numbers they wish to operate on. The program then uses PHP‘s built-in mathematical functions to perform the operation and display the result to the user.

The program can also include basic error handling and validation to ensure that the user inputs are in the correct format and to prevent any unexpected results. For example, the program can check that the inputs are numeric and that the user has selected a valid operation.

It’s important to note that this is a simple calculator and not a scientific calculator, it can be used as a simple tool for basic mathematical operations but it may not have the advanced features of a scientific calculator such as trigonometry functions, logarithms, etc. Additionally, this program is intended to be run on the server side and the result will be displayed on the browser, it won’t have the capability of running on a standalone device like a traditional calculator.


This code creates a simple HTML form with two input fields for numbers and a dropdown menu for selecting an operator. When the form is submitted, the PHP code retrieves the values of the input fields and the selected operator, and performs the appropriate calculation. The result is then displayed on the page. Here is an example of a simple calculator program written in PHP:

<html>
<head>
  <title>Calculator</title>
</head>
<body>
  <form action="calculator.php" method="post">
    <input type="text" name="num1" placeholder="Number 1">
    <input type="text" name="num2" placeholder="Number 2">
    <select name="operator">
      <option>None</option>
      <option>Add</option>
      <option>Subtract</option>
      <option>Multiply</option>
      <option>Divide</option>
    </select>
    <br>
    <button type="submit" name="submit" value="submit">Calculate</button>
  </form>
  <p>The answer is:</p>
  <?php
    if (isset($_POST['submit'])) {
      $result1 = $_POST['num1'];
      $result2 = $_POST['num2'];
      $operator = $_POST['operator'];
      switch ($operator) {
        case "None":
          echo "You need to select a method!";
          break;
        case "Add":
          echo $result1 + $result2;
          break;
        case "Subtract":
          echo $result1 - $result2;
          break;
        case "Multiply":
          echo $result1 * $result2;
          break;
        case "Divide":
          echo $result1 / $result2;
          break;
      }
    }
  ?>
</body>
</html>

I hope this helps! Let me know if you have any questions or need further assistance.

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