基于特定值的分组数组

Question

我有一个基本数组，我希望根据x字段值对其进行分组。我想保持这些值仍然在一个数组中。我已经尝试了多种foreach，for循环，但没有运气得到它我想要的。我怎样才能达到以下的预期结果？

$originalArray = [ 
    [ 
     'x' => 'test', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test2', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test2', 
     'y' => 'blah', 
    ], 
]; 

Desired Result: 
[ 
    'test' => [ 
     [ 
      'x' => 'test', 
      'y' => 'blah', 
     ], 
     [ 
      'x' => 'test', 
      'y' => 'blah', 
     ], 
    ], 
    'test2' => [ 
     [ 
      'x' => 'test2', 
      'y' => 'blah', 
     ], 
     [ 
      'x' => 'test2', 
      'y' => 'blah', 
     ], 
    ], 
]; 

Answer 1

希望这是你想要什么：

$originalArray = [ 
    [ 
     'x' => 'test', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test2', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test2', 
     'y' => 'blah', 
    ], 
]; 
$desired_array = array(); 
foreach ($originalArray as $key => $value) { 
    $desired_array[$value['x']][]=$value; 
} 
var_dump($desired_array);