Array of type class

[nebulom]

I'm making a class (just basics) and I need help on returning an array of my object. Something like this

<?php
class comment{
    function select_all(){
        // I should return all comments from the database.
    }
}
?>

Something like this in java.

import java.util.*;
public class comment{
    public List<comment> select_all(){
        List<comment> list=new ArrayList<comment>();
        return list;
    }
}

Hope I don't make non sense post.