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<?php function transformQuestionnaire($arr) { $new_arr = array(); foreach ($arr as $array){ if (!in_array($array['code'], array_keys($new_arr))){ //not a double $new_arr[$array['code']] = $array['answer']; } else { //Append it to the existing value $new_arr[$array['code']] .= '|' . $array['answer']; } } 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 git.master, git.master_jit, rfc.property-hooks
array(1) { ["QL_ckbxtest"]=> string(7) "Neen|Ja" }

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