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run code in 150+ php & hhvm versions
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<?php $array = array( 'filters'=> array('where'=>array('yr'=>1994))); echo array_keys($array['filters']['where'])[0];
based on CZqmA
Output for 5.4.0 - 7.1.0
yr
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ',' or ';' in /in/HO0ke 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 '[', expecting ',' or ';' in /in/HO0ke on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `','' or `';'' in /in/HO0ke on line 3
Process exited with code 255.