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run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = [ 1847630 => [ [ 'ip' => '2001:19f0:5800:8561:5400:00ff:fe07:cae5' ] ] ]; $foo = reset($arr); var_dump($foo[0]['ip']);
based on 3bGCg
Output for 5.4.0 - 7.1.7, 7.2.0
string(39) "2001:19f0:5800:8561:5400:00ff:fe07:cae5"
Output for 7.1.10

Process exited with code 137.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/tVZjQ on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/tVZjQ on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/tVZjQ on line 3
Process exited with code 255.