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run code in 150+ php & hhvm versions
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<?php function transformQuestionnaire($arr) { $new_arr = array(); foreach ($arr as $array){ if (!in_array($array[0], array_keys($new_arr))){ //not a double $new_arr[$array[0]] = $array[1]; } else { //Append it to the existing value $new_arr[$array[0]] .= '|' . $array[1]; } } return $new_arr; } $input = array ( 0 => array( 'nr' => '2', 'code' => 'QL_ckbxtest', 'question' => 'Checkboxtest', 'answer' => 'Neen', 'lang' => 'nl', ), 1 => array( 'nr' => '2', 'code' => 'QL_ckbxtest', 'question' => 'Checkboxtest', 'answer' => 'Ja', 'lang' => 'nl', ), ); print(var_dump(transformQuestionnaire($input))); ?>
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined offset: 0 in /in/1mbpW on line 5 Notice: Undefined offset: 0 in /in/1mbpW on line 6 Notice: Undefined offset: 1 in /in/1mbpW on line 6 Notice: Undefined offset: 0 in /in/1mbpW on line 5 Notice: Undefined offset: 0 in /in/1mbpW on line 8 Notice: Undefined offset: 1 in /in/1mbpW on line 8 array(1) { [""]=> string(1) "|" }
Output for hhvm-3.12.0
Notice: Undefined index: 0 in /in/1mbpW on line 5 Notice: Undefined index: 0 in /in/1mbpW on line 6 Notice: Undefined index: 1 in /in/1mbpW on line 6 Notice: Undefined index: 0 in /in/1mbpW on line 5 Notice: Undefined index: 0 in /in/1mbpW on line 8 Notice: Undefined index: 1 in /in/1mbpW on line 8 array(1) { [""]=> string(1) "|" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 0 in /in/1mbpW on line 5 Notice: Undefined offset: 0 in /in/1mbpW on line 6 Notice: Undefined offset: 1 in /in/1mbpW on line 6 Notice: Undefined offset: 0 in /in/1mbpW on line 5 Notice: Undefined offset: 0 in /in/1mbpW on line 8 Notice: Undefined offset: 1 in /in/1mbpW on line 8 array(1) { [""]=> string(1) "|" }