Creating a nested array based on a value

I have a nested array that I want to process into another nested array based on the value in the original.

Here's my original array, it is nested because I will be entering other values ​​later.

$dataArray = array (
    0 => array(
            "adgroupid" => "5426058726"
    ),
    1 => array(
            "adgroupid" => "5426058086"
    ),
    2 => array(
            "adgroupid" => "5426058086"
    ),
    3 => array(
            "adgroupid" => "5426058087"
    ),
    4 => array(
            "adgroupid" => "5426058087"
    ),
    5 => array(
            "adgroupid" => "5426058088"
    ),
    6 => array(
            "adgroupid" => "5426058089"
    ),
    7 => array(
            "adgroupid" => "5426058089"
    ),
    8 => array(
            "adgroupid" => "5426058090"

      

        
        
        
      

    

Here's the result I am currently getting, note that the rows in arrays 1 and 2 must be nested in the same array, for example 3 and 5 .

array (size=10)
  0 => 
    array (size=1)
      0 => string '5426058726' (length=10)
  1 => 
    array (size=1)
      0 => string '5426058086' (length=10)
  2 => 
    array (size=1)
      0 => string '5426058086' (length=10)
  3 => 
    array (size=2)
      0 => string '5426058087' (length=10)
      1 => string '5426058087' (length=10)
  4 => 
    array (size=1)
      0 => string '5426058088' (length=10)
  5 => 
    array (size=2)
      0 => string '5426058089' (length=10)
      1 => string '5426058089' (length=10)
  6 => 
    array (size=4)
      0 => string '5426058090' (length=10)

      

        
        
        
      

    

Here is my code, I need to use an if statement because at a later stage I want to introduce a different argument:

$newdataArray = array();
$j = 0; // Set value of working variables
$adgroupidcheck = 0;

foreach ($dataArray as $value) { // Loop through the array

    if( $adgroupidcheck != $value['adgroupid'] ) { // Check $adgroupidcheck
        $newdataArray[][] = $value['adgroupid']; // Create a new nested array
        $j ++; // increment $j
    } else {
        $newdataArray[$j][] = $value['adgroupid'];  // Add to the current array
    }
    $adgroupidcheck = $value['adgroupid']; // Set $adgroupidcheck
}

      

        
        
        
      

    

So my problem is that my code only works after the first instance of the array check loop has failed.

Any help would be appreciated.

Thank.