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  4. Separate the city and state name in the array so we can total by state
$population = array('New York'     => array('state' => 'NY', 'pop' => 8008278),
                    'San Antonio'  => array('state' => 'TX', 'pop' => 1144646),
                    'Detroit'      => array('state' => 'MI', 'pop' => 951270));
$state_totals = array();
$total_population = 0;
print "\n";
foreach ($population as $city => $info) {
    $total_population += $info['pop'];
    $state_totals[$info['state']] += $info['pop'];
    print "\n";
    
}
foreach ($state_totals as $state => $pop) {
    print "\n";
}
print "\n";
print "
CityPopulation
$city, {$info['state']}{$info['pop']}
$state$pop
Total$total_population
\n";
?>