How does PDOStatement define member variables and store query results?

The object in the PDOStatement class is a bit incomprehensible when reading a book. Looking at the PHP documentation, there is only one member variable queryString in the definition of PDOStatement. However, the member variables of the PDOStatement object instantiated by the query statement contain the database query result: {code...}... the object of the PDOStatement class is a bit incomprehensible when reading a book. Looking at the PHP documentation, there is only one member variable queryString in the definition of PDOStatement. However, the member variables of the PDOStatement object instantiated by the query statement contain the database query results:

$ Db = new PDO ('sqlite:/tmp/student '); $ rows = $ db-> query ('select name, age FROM student '); foreach ($ rows-> fetchAll () as $ row) {// appropriate statement}

The above $ rows is the query result. It is a PDOStatement object, which clearly contains the query result as a member variable. How to implement it? I want to view the source code, but I have no details.

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The object in the PDOStatement class is a bit incomprehensible when reading a book. Looking at the PHP documentation, there is only one member variable queryString in the definition of PDOStatement. However, the member variables of the PDOStatement object instantiated by the query statement contain the database query results:

$ Db = new PDO ('sqlite:/tmp/student '); $ rows = $ db-> query ('select name, age FROM student '); foreach ($ rows-> fetchAll () as $ row) {// appropriate statement}

The above $ rows is the query result. It is a PDOStatement object, which clearly contains the query result as a member variable. How to implement it? I want to view the source code, but I have no details.

But does the member variable of the PDOStatement object instantiated by the query statement contain the database query result?
$ Rows-> fetchAll ()? Is this a member variable?