PHP 5.5 Action Management with Parameters (English Version)

PHP 5.5 Action Management with Parameters (English Version)

Here's a PHP 5.5 compatible script that uses URL parameters instead of paths for all operations:

<?php
// Start session for persistent storage
session_start();

// Initialize the stored action if not set
if (!isset($_SESSION['stored_action'])) {
    $_SESSION['stored_action'] = null;
}

// Process requests based on parameters
if (isset($_GET['action'])) {
    // Store the action value
    $_SESSION['stored_action'] = $_GET['action'];
    echo "Action stored: " . htmlspecialchars($_GET['action']);
} elseif (isset($_GET['cmd'])) {
    $command = strtolower($_GET['cmd']);
    
    if ($command === 'status') {
        // Return the stored action value
        $action = $_SESSION['stored_action'];
        echo "Current action: " . ($action ? htmlspecialchars($action) : "No action stored");
    } elseif ($command === 'delete') {
        // Delete the stored action
        $_SESSION['stored_action'] = null;
        echo "Action deleted successfully";
    } else {
        echo "Invalid command";
    }
} else {
    // Display usage instructions
    echo "<h1>Action Management System</h1>";
    echo "<p>Usage:</p>";
    echo "<ul>";
    echo "<li>Add <code>?action=value</code> to store a value</li>";
    echo "<li>Add <code>?cmd=status</code> to view stored value</li>";
    echo "<li>Add <code>?cmd=delete</code> to delete stored value</li>";
    echo "</ul>";
    echo "<p>Examples:</p>";
    echo "<ul>";
    echo "<li><a href='?action=test_value'>?action=test_value</a></li>";
    echo "<li><a href='?cmd=status'>?cmd=status</a></li>";
    echo "<li><a href='?cmd=delete'>?cmd=delete</a></li>";
    echo "</ul>";
}
?>

How to Use

1. Store an action value:

   • URL: yourscript.php?action=your_value
   • Example: yourscript.php?action=open_door

2. Check stored value:

   • URL: yourscript.php?cmd=status
   • Will display the currently stored action

3. Delete stored value:

   • URL: yourscript.php?cmd=delete
   • Clears the stored action

Key Features

1. Uses URL parameters for all operations (action, cmd)
2. Session-based storage persists between requests
3. Full English interface and comments
4. Input sanitization with htmlspecialchars()
5. Case-insensitive command handling
6. Clear usage instructions
7. PHP 5.5 compatible

Security Notes

• Always sanitize output with htmlspecialchars()
• Session storage is more secure than using a global variable
• Consider adding CSRF protection for production use
• For sensitive data, consider database storage instead of sessions