resources - How to get instance ID with PHP -

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I see a way to get the example ID of a given object / resource with PHP, in the same way var_dump () Does: 

  var_dump (curl_init ()); // Resource # 1 type curl var_dump (curl_init ()); / Resource # 2 Type Curl

How do I get the frequency calculation without calling var_dump ()? Is this possible?

To get the resource ID, change it to an integer: 

  $ Resource = curl_init (); Var_dump ($ resource); Var_dump (intval ($ resource));

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