How can PHP developers effectively manage and troubleshoot issues related to user input validation and error handling in a project like this cylinder calculation tool?

Issue: PHP developers can effectively manage and troubleshoot issues related to user input validation and error handling in a project like this cylinder calculation tool by implementing proper validation checks for user input, sanitizing the input data to prevent any malicious code injection, and displaying clear error messages to guide users in providing correct input. 

<?php
// Validate user input for radius and height
if(isset($_POST['radius']) && isset($_POST['height'])){
    $radius = $_POST['radius'];
    $height = $_POST['height'];

    // Validate if input is numeric and greater than 0
    if(is_numeric($radius) && is_numeric($height) && $radius > 0 && $height > 0){
        // Calculate cylinder volume
        $volume = 3.14 * pow($radius, 2) * $height;
        echo "The volume of the cylinder is: " . $volume;
    } else {
        echo "Please enter valid numeric values for radius and height greater than 0.";
    }
} else {
    echo "Please provide values for both radius and height.";
}
?>

Keywords

PHP user input validation error handling troubleshooting cylinder calculation project management

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