What do these symbols mean?

What do these symbols mean ;? Php & nbsp; $ mysqlinew & nbsp; mysqli (localhost, root, xsphpdb); & nbsp; $ stmt $ mysqli-& gt; stmt_init (); & nbsp; & meaning of each symbol

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

    $stmt=$mysqli->stmt_init();

    var_dump($stmt);

    $mysqli->close();

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

Where #2 means 0, and curly brackets

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------ Solution --------------------
Object (mysqli_stmt) #2 (0 ){}
Indicates
Object (mysqli_stmt) this is a mysqli_stmt object
#2 is the second in the mysqli Object series ($ mysqli is the first)
(0) the number of members is 0 (only list attributes)
{} So it is an empty set

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