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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Cookie-based flash messages for stateless operation. |
| 5 | * |
| 6 | * Replaces session-based flash messages with cookie storage. |
| 7 | * Messages are stored as JSON in a cookie and cleared after reading. |
| 8 | * |
| 9 | * Usage: |
| 10 | * CookieFlash::set('Your message', 'success') // Set flash message |
| 11 | * CookieFlash::get() // Get and clear message |
| 12 | * CookieFlash::getType() // Get message type (info/success/error) |
| 13 | * CookieFlash::has() // Check if message exists |
| 14 | */ |
| 15 | class CookieFlash |
| 16 | { |
| 17 | private const COOKIE_NAME = 'flash_message'; |
| 18 | |
| 19 | /** |
| 20 | * @var array|null Cached flash data |
| 21 | */ |
| 22 | private static ?array $cache = null; |
| 23 | |
| 24 | /** |
| 25 | * Set a flash message. |
| 26 | * |
| 27 | * @param string $message The message to display |
| 28 | * @param string $type Message type: 'info', 'success', 'error', 'warning' |
| 29 | */ |
| 30 | public static function set(string $message, string $type = 'info'): void |
| 31 | { |
| 32 | $data = [ |
| 33 | 'message' => $message, |
| 34 | 'type' => $type, |
| 35 | ]; |
| 36 | |
| 37 | $json = json_encode($data); |
| 38 | $_COOKIE[self::COOKIE_NAME] = $json; |
| 39 | setcookie(self::COOKIE_NAME, $json, time() + 60, '/'); // 60 second expiry |
| 40 | self::$cache = $data; |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * Get and clear the flash message. |
| 45 | * |
| 46 | * @return string|null The message, or null if none exists |
| 47 | */ |
| 48 | public static function get(): ?string |
| 49 | { |
| 50 | $data = self::load(); |
| 51 | if (!$data) |
| 52 | return null; |
| 53 | |
| 54 | // Clear the cookie after reading |
| 55 | self::clear(); |
| 56 | |
| 57 | return $data['message']; |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * Get the message type without clearing. |
| 62 | * |
| 63 | * @return string The type ('info', 'success', 'error', 'warning') |
| 64 | */ |
| 65 | public static function getType(): string |
| 66 | { |
| 67 | $data = self::load(); |
| 68 | return $data['type'] ?? 'info'; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Check if a flash message exists. |
| 73 | * |
| 74 | * @return bool True if a message exists |
| 75 | */ |
| 76 | public static function has(): bool |
| 77 | { |
| 78 | return self::load() !== null; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Clear the flash message. |
| 83 | */ |
| 84 | public static function clear(): void |
| 85 | { |
| 86 | unset($_COOKIE[self::COOKIE_NAME]); |
| 87 | setcookie(self::COOKIE_NAME, '', time() - 3600, '/'); |
| 88 | self::$cache = null; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Clear internal cache (for testing). |
| 93 | */ |
| 94 | public static function clearCache(): void |
| 95 | { |
| 96 | self::$cache = null; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Load flash data from cookie. |
| 101 | * |
| 102 | * @return array|null The flash data array or null |
| 103 | */ |
| 104 | private static function load(): ?array |
| 105 | { |
| 106 | if (self::$cache !== null) |
| 107 | return self::$cache; |
| 108 | |
| 109 | if (!isset($_COOKIE[self::COOKIE_NAME]) || empty($_COOKIE[self::COOKIE_NAME])) |
| 110 | return null; |
| 111 | |
| 112 | $decoded = json_decode($_COOKIE[self::COOKIE_NAME], true); |
| 113 | if (!is_array($decoded) || !isset($decoded['message'])) |
| 114 | return null; |
| 115 | |
| 116 | self::$cache = $decoded; |
| 117 | return self::$cache; |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * Render flash message as HTML (for use in views). |
| 122 | * |
| 123 | * Automatically gets type before clearing, then renders the message. |
| 124 | * |
| 125 | * @return string HTML output or empty string |
| 126 | */ |
| 127 | public static function render(): string |
| 128 | { |
| 129 | if (!self::has()) |
| 130 | return ''; |
| 131 | |
| 132 | $type = self::getType(); // Get type BEFORE get() clears it |
| 133 | $message = self::get(); |
| 134 | |
| 135 | $cssClass = match ($type) |
| 136 | { |
| 137 | 'error' => 'alert-error', |
| 138 | 'success' => 'alert-success', |
| 139 | 'warning' => 'alert-warning', |
| 140 | default => 'alert-info', |
| 141 | }; |
| 142 | |
| 143 | return '<div class="alert ' . $cssClass . '">' . htmlspecialchars($message) . '</div>'; |
| 144 | } |
| 145 | } |