<?php 

$location= $_POST['location_entered'];


if (!empty($location))
{
$url= 'https://maps.googleapis.com/maps/api/geocode/xml?address=' . urlencode($location);

$xmlcontent= file_get_contents($url);

$xmlload= simplexml_load_string($xmlcontent);


$zipcode= $xmlload->result->address_component[7]->long_name;

}


?>



<form action="" method="POST">
Enter the location: <input type="text" name="location_entered" value='<?php echo $location; ?>'/><br>
<input type="submit" name="Submit"/><br>



&lt;?php 

echo "Zip code: $zipcode";

?>