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<?php unserialize(a:2:{i:0;a:1:{s:7:"user_id";s:1:"8";}i:1;a:1:{s:7:"user_id";s:1:"8";}})
Output for 5.3.0 - 5.4.22
Parse error: syntax error, unexpected ':' in /in/vvS0Q on line 3
Process exited with code 255.