What are common pitfalls to avoid when transferring variables between PHP pages?

One common pitfall to avoid when transferring variables between PHP pages is not properly sanitizing user input, which can leave your application vulnerable to security risks such as SQL injection attacks. To solve this issue, always sanitize and validate user input before transferring it between pages. 

// Sanitize and validate user input before transferring variables between PHP pages
$user_input = $_POST['user_input'];
$sanitized_input = filter_var($user_input, FILTER_SANITIZE_STRING);

Keywords

variable scope global keyword session variables superglobals data validation

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