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run code in 150+ php & hhvm versions
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<?php $your_array = array(array("December 2012" => 58), array("December 2012" => 58) ); $res = array(); foreach($your_array as $val){ $res[key($val)][] = $val[key($val)]; } foreach($res as $k=>&$v){ $v = array_sum($v)/count($v); } echo "<pre>"; print_r($res);
Output for 5.0.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<pre>Array ( [December 2012] => 58 )
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/DqVrr on line 10
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/DqVrr on line 10
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/DqVrr on line 10
Process exited with code 255.