How can the use of isset() and is_numeric() functions enhance the functionality and reliability of a PHP calculator program?

When building a PHP calculator program, it is crucial to ensure that the input values are set and numeric before performing any calculations. Using the isset() function helps to check if the input values are set, while the is_numeric() function ensures that the input values are indeed numeric. By incorporating these functions into the program, you can enhance its functionality and reliability by preventing errors that may arise from invalid or missing input values. 

<?php
if(isset($_POST['num1']) && isset($_POST['num2']) && is_numeric($_POST['num1']) && is_numeric($_POST['num2'])){
    $num1 = $_POST['num1'];
    $num2 = $_POST['num2'];
    
    // Perform calculations here
    
} else {
    echo "Please enter valid numeric values for calculation.";
}
?>

Keywords

isset is_numeric PHP calculator program functionality reliability

Related Questions