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<?php function transformQuestionnaire($arr) { $new_arr = array(); foreach ($arr as $array){ $key = reset($array); $val = end($array); if (!in_array($key, array_keys($new_arr))){ //not a double $new_arr[$key] = $val; } else { //Append it to the existing value $new_arr[$key] .= '|' . $val; } } return $new_arr; } $input = array( array("one", "potato"), array("two", "fries"), array("one", "ketchup"), array("two", "steak")); print(var_dump(transformQuestionnaire($input))); ?>
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["one"]=> string(14) "potato|ketchup" ["two"]=> string(11) "fries|steak" }

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