Php 按前 3 列对二维数组中的行数据进行分组，然后用逗号连接每组中的其余列

如果‘u’、‘v’和‘w’键下的值相同，我想合并多维数组的值.

$myarray = array (
  '0' => 
    array (
      'u' => '30', 
      'v' => '16', 
      'w' => '22',        
      'x' => '30', 
      'y' => '16', 
      'z' => '22',  
),
  '1' => 
    array (
      'u' => '32', 
      'v' => '25', 
      'w' => '1',        
      'x' => '30', 
      'y' => '16', 
      'z' => '22',
),   
  '2' => 
    array (
      'u' => '30', 
      'v' => '16', 
      'w' => '22',        
      'x' => '54', 
      'y' => '96', 
      'z' => '2',
),   
  '3' => 
    array (
      'u' => '30', 
      'v' => '16', 
      'w' => '22',        
      'x' => '3', 
      'y' => '1', 
      'z' => '6',
)    
); 

我希望输出如下:

//OUTPUT

array (
  '0' => 
    array (
      'u' => '30', 
      'v' => '16', 
      'w' => '22',        
      'x' => '30,54,3', 
      'y' => '16,96,1', 
      'z' => '22,2,6',  
),
  '1' => 
    array (
      'u' => '32', 
      'v' => '25', 
      'w' => '1',        
      'x' => '30', 
      'y' => '16', 
      'z' => '22',
)   
) 

这就是我到目前为止一直试图做的事情，但对我来说并不奏效.

<?php
$n = 0;            
$output = [];
foreach ($myarray as $row) {
    
    $prevkey = key(array_slice($output, -1,1,true));// get previous array key    
    
    if(array_key_exists('0', $output)){
        
        if($output[$prevkey]['u'] == $row['u'] && $output[$prevkey]['v'] == $row['v'] &&   $output[$prevkey]['w'] == $row['w'] ){
            echo "yes <br>";
           $output += $row;
        }
        
    }else{
      $output[] = $row;  
    }
    $n++;
}

var_dump($output); 
?>