<?php
    $states = array(
                    "United states" => 
                        array(
                            "population" => "22,12,000", 
                            "captial" => "Washington"
                        ),
                        "Washington" => 
                            array( 
                                "population" => "9,80,000", 
                                "captial" => "Washington"
                            )
    );
    
    echo  $states["United states"]["population"];
?>