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<?php session_start(); var_dump(session_decode('test|a:1:{i:0;i:23}'), $_SESSION);
based on mSW5n
Output for 5.4.45, 5.5.29 - 5.5.35, 5.6.13 - 7.2.0
Warning: session_decode(): Failed to decode session object. Session has been destroyed in /in/BQq6P on line 5 bool(false) array(0) { }
Output for 5.3.20 - 5.4.44, 5.5.24 - 5.5.28, 5.6.8 - 5.6.12
bool(true) array(1) { ["test"]=> NULL }