What do you mean by this symbol?

What do you mean by this symbol?

 
      $mysqli =new mysqli ("localhost", "root", "" "," xsphpdb ");

    $stmt = $mysqli->stmt_init ();

    Var_dump ($stmt);

    $mysqli->close ();

The result is:
Object (MYSQLI_STMT) #2 (0) { }

What's the meaning of # 0 and the curly braces behind it?

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------Solution--------------------
Object (mysqli_stmt) #2 (0) {}
Said
Object (MYSQLI_STMT) This is a Mysqli_stmt object
#2 is the second of the Mysqli object series ($mysqli is the first one)
(0) The number of members is 0 (only attributes are listed)
{} Therefore an empty collection

------Solution--------------------
objects and arrays of different data structures
Output Mode object $m->name array $m[' name ']

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