hello everybody here is my array(s)

$us_census = array('NY' => array('New York' => 8008278),
                                   'CA' => array('Los Angeles' => 3694820,
                                                                 'San Diego' => 
1223400),
                                   'IL' => array('Chicago' => 2896016),
                                   'TX' => array('Houston' => 1953631,
                                                                 'Dallas' => 
1188580,
                                                                 'San Antonio' 
=> 1144646),
                                   'PA' => array('Philadelphia' => 1517550),
                                   'AZ' => array('Phoenix' => 1321045),
                                   'MI' => array('Detroit' => 951270)); 



print 
"<table><tr><th>State</th><th>City</th><th>Population</th><th>Total</th></tr>";

                   
// $state is the key and $states is the value 
foreach ($us_census as $state => $cities) {

        // $state is the key and $habitant is the value
        foreach ($cities as $city => $habitants){


                
                print 
"<tr><td>$state</td><td>$city</td><td>$habitants</td><td></td></tr>";
                
                
                }
        }


Now i also want to be able to count the total population per state, i am 
stucked...
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