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run code in 150+ php & hhvm versions
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<?php $table_array = array(); $result = array('hi', 'hello', 'there'); array_walk($result, function(&$row) { printf('%s ', $row); $index = &$row; $table_array[$index] = array(); }); print_r($table_array);
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
hi hello there Array ( )
Output for hhvm-3.10.0

Process exited with code 137.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/gn7MJ on line 4
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 T_FUNCTION in /in/gn7MJ on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/gn7MJ on line 4
Process exited with code 255.