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run code in 150+ php & hhvm versions
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<?php $keys = array('name', 'type', 'tmp_name', 'error', 'size'); $fileArr = array('name'); $fileKeys = arary_keys($fileArr); var_dump(empty( array_diff( $fileKeys, $keys) ));
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: Call to undefined function arary_keys() in /in/WU3gO:4 Stack trace: #0 {main} thrown in /in/WU3gO on line 4
Process exited with code 255.
Output for 5.5.24 - 5.6.28, hhvm-3.12.0
Fatal error: Call to undefined function arary_keys() in /in/WU3gO on line 4
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.4.45
Fatal error: Can't use function return value in write context in /in/WU3gO on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_VARIABLE or '$' in /in/WU3gO on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_VARIABLE or '$' in /in/WU3gO on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/WU3gO on line 5
Process exited with code 255.