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What potential issues can arise from using a POST-REDIRECT-GET solution in PHP for form submissions?

One potential issue that can arise from using a POST-REDIRECT-GET solution in PHP for form submissions is losing form data if validation fails. To solve this issue, you can store the form data in session variables before the redirect and repopulate the form fields with the stored data if validation fails.

php 
```php
// Start the session
session_start();

// Check if form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Store form data in session variables
    $_SESSION['form_data'] = $_POST;
    
    // Validate form data
    if (/* validation fails */) {
        // Redirect back to the form page
        header("Location: form.php");
        exit();
    }
    
    // Clear the form data from session
    unset($_SESSION['form_data']);
}

// Repopulate form fields with stored data
$data = isset($_SESSION['form_data']) ? $_SESSION['form_data'] : [];
```

Note: Make sure to validate and sanitize the form data before storing it in session variables to prevent security vulnerabilities.

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