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How can PHP scripts be structured to prevent users from bypassing validation checks?

To prevent users from bypassing validation checks in PHP scripts, you can structure your code in a way that the validation logic is centralized and cannot be easily bypassed by direct user input. One way to achieve this is by placing the validation checks in a separate function or class method that is called before processing any user input.

php 
// Example of structuring PHP script to prevent users from bypassing validation checks

function validateInput($input) {
    // Add your validation logic here
    if (/* validation fails */) {
        return false;
    }
    return true;
}

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    if (validateInput($_POST['input'])) {
        // Process the input if validation passes
    } else {
        // Handle validation error
    }
}

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