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<?php session_start(); var_dump(session_decode('core|a:4:{s:23:"_session_validator_data";a:4:{s:11:"remote_addr";s:9:"127.0.0.1";s:8:"http_via";s:0:"";s:20:"http_x_forwarded_for";s:0:"";s:15:"http_user_agent";s:19:""}}test|a:1:{i:23;}'), $_SESSION);
Output for 5.5.29 - 5.5.38, 5.6.13 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: session_decode(): Failed to decode session object. Session has been destroyed in /in/GdgNq on line 5 bool(false) array(0) { }
Output for 5.5.0 - 5.5.28, 5.6.0 - 5.6.12
bool(true) array(1) { ["core"]=> NULL }

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218.05 ms | 402 KiB | 329 Q