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<?php class MySessionHandler implements \SessionHandlerInterface { public $messages = array(); public function open($savePath, $sessionName) { $this->messages[] = 'open ' . $sessionName; } public function close() { $this->messages[] = 'close'; } public function read($id) { $this->messages[] = 'read ' . $id; } public function write($id, $data) { $this->messages[] = 'write ' . $id . ': ' . $data; } public function destroy($id) { $this->messages[] = 'destroy ' . $id; } public function gc($maxlifetime) { $this->messages[] = 'gc ' . $maxlifetime; } public function __destroy() { var_dump($this->messages); } } $handler = new MySessionHandler(); session_set_save_handler($handler, true); session_start(); $_SESSION['foo'] = 'bar'; $handler->messages[] = session_id(); session_regenerate_id(); $handler->messages[] = session_id(); session_write_close(); session_start(); session_destroy(); $handler->messages[] = var_export($_SESSION, true); $handler->messages[] = session_id(); session_id('new'); session_start(); $_SESSION['john'] = 'doe';
Output for 7.2.0 - 7.3.1
Warning: session_start(): Session callback expects true/false return value in /in/YlCc7 on line 46 Warning: session_start(): Session callback expects true/false return value in /in/YlCc7 on line 46 Warning: session_start(): Failed to initialize storage module: user (path: ) in /in/YlCc7 on line 46 Warning: session_regenerate_id(): Cannot regenerate session id - session is not active in /in/YlCc7 on line 51 Warning: session_start(): Cannot start session when headers already sent in /in/YlCc7 on line 56 Warning: session_destroy(): Trying to destroy uninitialized session in /in/YlCc7 on line 57 Warning: session_id(): Cannot change session id when headers already sent in /in/YlCc7 on line 62 Warning: session_start(): Cannot start session when headers already sent in /in/YlCc7 on line 63
Output for 7.1.0 - 7.1.25
Warning: session_start(): Session callback expects true/false return value in /in/YlCc7 on line 46 Warning: session_start(): Session callback expects true/false return value in /in/YlCc7 on line 46 Fatal error: session_start(): Failed to initialize storage module: user (path: ) in /in/YlCc7 on line 46
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Warning: session_start(): Session callback expects true/false return value in /in/YlCc7 on line 46 Fatal error: session_start(): Failed to initialize storage module: user (path: ) in /in/YlCc7 on line 46 Warning: Unknown: Session callback expects true/false return value in Unknown on line 0
Process exited with code 255.
Output for 5.4.0 - 5.4.20, 5.4.22 - 5.6.28
Output for 5.4.21

Process exited with code 137.
Output for 5.3.0 - 5.3.29
Fatal error: Interface 'SessionHandlerInterface' not found in /in/YlCc7 on line 5
Process exited with code 255.
Output for 5.0.5 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/YlCc7 on line 4 Fatal error: Interface 'SessionHandlerInterface' not found in /in/YlCc7 on line 4
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/YlCc7 on line 4 Fatal error: Class 'SessionHandlerInterface' not found in /in/YlCc7 on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/YlCc7 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/YlCc7 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/YlCc7 on line 4
Process exited with code 255.