如何在PHP中迭代JSON

In the following JSON, I want to fetch all the customers phone and store in a array:

{  
   "MetaInformation":{  
      "@TotalResources":1,
      "@TotalPages":1,
      "@CurrentPage":1
   },
   "Customers":[  
      {  
         "@url":"https:\/\/URL/customers\/1",
         "Address1":"Mumbai",
         "City":"Mumbai",
         "CustomerNumber":"1",
         "Email":"xyz@gmail.com",
         "Name":"Saurabh Pradhan",
         "OrganisationNumber":"",
         "Phone":"91xxx",
         "ZipCode":"45153"
      }
   ]
}

I tried using following but it keeps throwing me error "Trying to get property of non-object in":

$customer_json = json_decode($api->getAllCustomers());    
$customer_json->Customers[0]->Phone;

The problem is that PHP representation of JSON object is not an object. PHP uses associative arrays instead. For convinient behavior use:

$customer_json = json_decode($api->getAllCustomers(), true);
$customer_json['Customers'][0]['Phone'];