really weird symbol in php?

Question

what does the ∫ symbol mean in php? Here is copy/paste of my var dump.. note the @user_id symbol then(0). Thanks! ``

           object(dbStoredProcedure)#13 (9) {
  ["dbh:private"]=>
  resource(27) of type (mssql link)
  ["sp_name:private"]=>
  string(24) "[dbo].[user_account_ins]"
  ["sp_parameters:private"]=>
  array(0) {
  }
  ["stmt:private"]=>
  resource(50) of type (mssql statement)
  ["parameters"]=>
  array(2) {
    ["@error"]=>
    &string(0) ""
    ["@user_id"]=>
    ∫(0)
  }
  ["results"]=>
  array(0) {
  }
  ["result"]=>
  array(0) {
  }
  ["query"]=>
  NULL
  ["error"]=>
  bool(false)
}

Answer 1

Your browser just displays the HTML entity reference &int as ∫.