3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function transformQuestionnaire($arr) { $new_arr = array(); foreach ($arr as $array){ if (!in_array($array[0], array_keys($new_arr))){ //not a double $new_arr[$key] = $array[1]; } else { //Append it to the existing value $new_arr[$key] .= '|' . $array[1]; } } return $new_arr; } $input = array( array("one", "potato"), array("two", "fries"), array("one", "ketchup"), array("two", "steak")); print(var_dump(transformQuestionnaire($input))); ?>
Output for 5.0.4 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined variable: key in /in/68bQP on line 6 Notice: Undefined variable: key in /in/68bQP on line 6 Notice: Undefined variable: key in /in/68bQP on line 6 Notice: Undefined variable: key in /in/68bQP on line 6 array(1) { [""]=> string(5) "steak" }
Output for hhvm-3.12.0
array(1) { [""]=> string(5) "steak" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: key in /in/68bQP on line 6 Notice: Undefined variable: key in /in/68bQP on line 6 Notice: Undefined variable: key in /in/68bQP on line 6 Notice: Undefined variable: key in /in/68bQP on line 6 array(1) { [""]=> string(5) "steak" }