Creating a multidimensional array

Example 1
  $MyMultiDimArray = array();
  $MyMultiDimArray[] = array(
    "id" =>  14,
    "name" => "Adam"
  );
Example 2
  $MyMultiDimArray = array(    
    0 =>  array(  
      "id" =>  14,
      "name" => "Adam",
    ),  
    1   =>  array(  
        "id" => 2032,
        "name" => "James"
    ), 
    2   =>  array(  
        "id" => 18,
        "name" => "Jane"
    )
  );
Example 3
  $MyMultiDimArray = array();
        
  if (!isset($MyMultiDimArray['DataAvailability']))
    $MyMultiDimArray['DataAvailability'] = array();
        
  if (!isset($Output['DataAvailability']['DeviceId']))
    $Output['DataAvailability']['DeviceId'] = array();

Does a field value exist within a multi dimensional array?

  $MyMultiDimArray = array(    
    0 =>  array(  
      "id" =>  14,
      "name" => "Adam",
    ),  
    1   =>  array(  
        "id" => 2032,
        "name" => "James"
    ), 
    2   =>  array(  
        "id" => 18,
        "name" => "Jane"
    )
  );


  //Simple exists or not
  if (array_search(2032, array_column($MyMultiDimArray, 'id')) !== False)
    echo 'FOUND!';
  else
    echo 'NOT FOUND!';


  //Get key if it exists - looking for match
  $Key = array_search(2032, array_column($MyMultiDimArray, 'id'));
  if ($Key !== False)
  {
    $Name = $MyMultiDimArray[$Key]['name'];
  }


  //Get key if it exists  - create if not exist
  $Key = array_search(2032, array_column($MyMultiDimArray, 'id'));
  if ($Key === False)
  {
    $MyMultiDimArray[]['id'] = 2032;
    $Key = count($MyMultiDimArray) - 1;
  }

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