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run code in 150+ php & hhvm versions
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<?php $input = Array( Array ( 0 => 1, a => "bala" ), Array ( 0 => 2, sma => "Bull" ) ); $result = call_user_func_array("array_merge", $input); var_export($result);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant a - assumed 'a' in /in/DUK6h on line 6 Notice: Use of undefined constant sma - assumed 'sma' in /in/DUK6h on line 11 array ( 0 => 1, 'a' => 'bala', 1 => 2, 'sma' => 'Bull', )