PHP Array baci

<?php
//simple Array
$city = array('Dhaka','Rangpur','Chittagong','Sylhet','Barishal','Khulna','Rajshahi');

// simple array with key
$bio  =  array('name'=>'Touhid','address'=>'Dinajpur, Bangladesh','job'=>'Programmer','email'=>'touhid@rafusoft.com','mobile'=>'01765997954','male'=>true);

echo $city[0];
echo "<br />\n";
echo $city[1];
echo "<br />\n";
echo $city[2];
echo "<br />\n";
echo $city[3];
echo "<br />\n";
echo $city[4];
echo "<br />\n";
echo $city[5];
echo "<br />\n";
echo $city[6];
echo "<br />\n";
?>

<h2>Touhid's Bio</h2>
<?php
echo $bio['name'];
echo "<br />\n";
echo $bio['address'];
echo "<br />\n";
echo $bio['job'];
echo "<br />\n";
echo $bio['email'];
echo "<br />\n";
echo $bio['mobile'];



?>