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<?php var_dump(unserialize('a:1:{s:0:""0a:0:{}};'));
based on tJcGZ
Output for 5.6.21 - 5.6.24, 7.0.6 - 7.3.0beta1
Notice: unserialize(): Error at offset 11 of 20 bytes in /in/EFThf on line 2 bool(false)
Output for 5.6.0 - 5.6.20, 7.0.0 - 7.0.5
array(1) { [""]=> array(0) { } }