How make simple calculator using php

to create a simple calculator using php, start by setting up a basic html form that allows users to input two numbers and select an operation (addition, subtraction, multiplication, or division). the form will submit the data to a php script for processing.

in the php script, retrieve the input values and the selected operation using the `$_post` method. based on the chosen operation, apply the appropriate arithmetic calculation using conditional statements (like `if` or `switch`). ensure to handle edge cases, such as division by zero, by implementing error checking and validation.

finally, display the result back to the user on the same page or redirect them to a results page. this simple calculator can be enhanced further with features like input validation, styling with css, or even javascript for a more dynamic user experience.
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