What best practices should be followed when passing data between PHP scripts using form submissions?

When passing data between PHP scripts using form submissions, it is important to sanitize and validate the input data to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. Additionally, it is recommended to use POST method for form submissions to keep sensitive data hidden from URL parameters. Finally, consider using sessions or cookies to store and access data across multiple scripts securely. 

// Example of passing data between PHP scripts using form submissions

// Sending data from form submission
<form action="process.php" method="post">
    <input type="text" name="username">
    <input type="password" name="password">
    <input type="submit" value="Submit">
</form>

// Receiving data in process.php
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = htmlspecialchars($_POST["username"]);
    $password = htmlspecialchars($_POST["password"]);

    // Sanitize and validate data before using it
}
?>

Keywords

POST method $_POST superglobal form validation data sanitization CSRF protection

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