What are best practices for handling user input in PHP to prevent automatic redirection to default files?

When handling user input in PHP, it is important to sanitize and validate the input to prevent security vulnerabilities such as automatic redirection to default files. To prevent this, always validate and sanitize user input before using it in any file operations or redirects. 

$user_input = $_POST['input'];

// Validate and sanitize user input
$clean_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Use the sanitized input in your logic
// For example, redirect to a specific page
header("Location: specific_page.php");
exit();

Keywords

PHP user input security validation redirection

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