php curl 假設(shè)他是數(shù)組，我要怎麼樣循環(huán)呢？

$data = array(
    
  );
  $data_string = json_encode($data);
  $ch = curl_init($api_signin);
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
  curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_HTTPHEADER, array(
      'Content-Type: application/json',
      'Content-Length: ' . strlen($data_string))
  );
  curl_setopt($ch, CURLOPT_TIMEOUT, 5);
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
  $result = curl_exec($ch);
  curl_close($ch);
  $data = json_decode($result);

假設(shè)請求後他有多筆資料會用數(shù)組
那我要怎麼寫while? or foreach？
應(yīng)該是說他有三層甚至四層array.....我要怎麼寫循環(huán)顯示？