Mostrar array único

[pateketrueke]

Para poder usar array_unique() primero debes agrupar los elementos en común, así:

Código PHP:

$list = [
  ['x' => 'a', 'y' => 1],
  ['x' => 'b', 'y' => 2],
  ['x' => 'a', 'y' => 3],
];
 
$groups = [];
 
foreach ($list as $object) {
  foreach ($object as $key => $value) {
    if (!isset($groups[$key])) {
      $groups[$key] = [];
    }
 
    $groups[$key] []= $value;
  }
}
 
foreach ($groups as $key => $group) {
  echo $key, ' = ', join(', ', array_unique($group)), "\n";
}