What potential pitfalls are associated with passing variables between pages in PHP?

One potential pitfall is the security risk of passing variables between pages without proper validation and sanitization, which can lead to vulnerabilities such as injection attacks. To mitigate this risk, it's important to validate and sanitize any user input before passing it between pages. 

// Example of validating and sanitizing input before passing it between pages
$input_variable = $_POST['input_variable'] ?? ''; // Get input variable from POST request
$validated_variable = filter_var($input_variable, FILTER_SANITIZE_STRING); // Sanitize input variable

// Pass validated variable to another page using a GET parameter
header("Location: next_page.php?validated_variable=" . urlencode($validated_variable));
exit();

Keywords

variable passing global variables session variables security vulnerabilities data leakage

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