What are some best practices for handling user input and passing values in PHP forms?

When handling user input in PHP forms, it is important to sanitize and validate the data to prevent security vulnerabilities such as SQL injection and cross-site scripting attacks. One best practice is to use PHP functions like htmlspecialchars() to escape special characters in user input before displaying it on the page. Additionally, always validate user input on the server-side before processing it to ensure that it meets the required format and criteria. 

// Sanitize user input using htmlspecialchars()
$user_input = htmlspecialchars($_POST['user_input']);

// Validate user input on the server-side
if (empty($user_input)) {
    echo "Please enter a valid input";
} else {
    // Process the validated user input
}

Keywords

Sanitization Validation htmlspecialchars filter_var $_POST

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