<?php
define('MAPQUEST_API_KEY', 'TheyKeyIGotFromMapQuest');

// In this example I am hard-coding the address into the variable $address.   In practice, you could
// read it in as a $_GET argument, from a database call or from pretty much anywhere else you'd like.
$address = "300 Alamo Plaza, San Antonio, TX 78205   (210) 555-5555
17000 W Ih 10 San Antonio TX 78257   210-555-5556
1 Lone Star Pass -- San Antonio, TX 78264
8210 Agora Parkway, Selma, TX 78148 (210)555-5557";
 
/*
   These next two lines deal with what system the data was entered on and whether carriage returns are
   treated as \r, \n or \r\n. Essentially I'm forcing any instance of \r to become \n which could potentially
   create a \n\n.  I then convert any instance of \n\n to a single \n. Now I can split strings up based on \n.
   There may be easier ways of doing this.  I just needed a quick solution and knew this would work. If you
   have a better solution for this let me know.
*/
 
$address = str_replace("\r", "\n", $address);
$address = str_replace("\n\n", "\n", $address);
 
// Now I take my addresses and tokenize them into an array using \n as my delimiter.
 
$addresses = explode("\n", $address);
 
// Now we want to strip phone numbers from addresses and put them into a separate array in case I need it later
$phones = array();
for ($i=0; $i<sizeof($addresses); $i++) {
        /*
         Replace anything that matches the specified phone number types with nothing and store the phone
         number in a separate array.  There's a lot that goes into this regular expression. It worked in
         all the cases I had. May not work in every case. It'd probably take half the page to explain what
         each piece does, so instead I will just refer you to:
                http://www.webcheatsheet.com/php/regular_expressions.php -- Regular Expression Cheat Sheat
        */
        if (preg_match('/\s*\({0,1}[0-9]{3}[)\-]{0,1}\s*[0-9]{3}\s*\-\s*[0-9]{4}\s*/', $addresses[$i], $matches)) {
                $addresses[$i] = str_replace($matches[0], "", $addresses[$i]);
                $phones[$i] = $matches[0];
        } else {
                $phones[$i] = "";
        }
}

// create curl resource for our connections
$ch = curl_init();
 
// set extreme values for the min/max lat/long.  
$lat_min = $lng_min = 999999;
$lat_max = $lng_max = -999999;
 
// create an array to store the coordinates for each location
$positions = array();
 
foreach ($addresses as $address) {
        // the URL for retrieving coordinates for given address
        $geocode_url = "http://www.mapquestapi.com/geocoding/v1/address?key=".MAPQUEST_API_KEY.
            "&callback=renderOptions&inFormat=kvp&outFormat=json&location=".urlencode($address);
 
        // Retrieve the data as JSON.  
        curl_setopt($ch, CURLOPT_URL, $geocode_url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $json = curl_exec($ch);
 
        // This example assumes retrieval worked properly. Feel free to add error detection to your code.
        // Mapquest wraps an extraneous renderOptions(); function around the JSON results that we need to get rid of.
        $json = str_replace(array("renderOptions(",");"), "", $json);
 
        // decode our json data
        $return = json_decode($json);
        // focus on the results portion of the data
        $results = $return->results[0];
        // focus on the resulots->locations portion of the data.
        $locations = $results->locations[0];
 
        // determine if any of our coordinates meet any of the extreme conditions and reset extremes accordingly
        if ($locations->latLng->lat > $lat_max) $lat_max = $locations->latLng->lat;
        if ($locations->latLng->lat < $lat_min) $lat_min = $locations->latLng->lat;
        if ($locations->latLng->lng > $lng_max) $lng_max = $locations->latLng->lng;
        if ($locations->latLng->lng < $lng_min) $lng_min = $locations->latLng->lng;
 
        // add coordinate to positions array in a format that will play nicely with plotting later
        $positions[] = "lat:".$locations->latLng->lat . ", lng:" . $locations->latLng->lng;
}
 
// calculate the center latitude and longitude
$center_lat = ($lat_min + $lat_max) / 2;
$center_lng = ($lng_min + $lng_max) / 2;

        //specify our map dimensions and scale size in pixels
        define('MAP_WIDTH', '500');
        define('MAP_HEIGHT', '400');
        define('MAP_SCALE_IN_PIXELS', '77');
 
        // This array contains the number of kilometers, the standard scale on mapquest contains at each zoom factor.
        $zoom_ranges = array(1840,630,210,71,32,14,7,3.2,1.6,0.8,0.4,0.2,0.1,0.05,0.03,0.02);
 
        // This is an implementation of the Haversine Formula that calculates distance in Kilometers between
        //    ($lat1,$lon1) and ($lat2,$lon2).
        function calculate_distance_km ($lat1, $lon1, $lat2, $lon2) {
                return ( 3958*3.14159265*sqrt( ($lat2-$lat1) * ($lat2-$lat1) +
                        cos($lat2/57.29578)*cos($lat1/57.29578)*($lon2-$lon1)*($lon2-$lon1))/180);
        }
 
        // calculate the change in X and Y coordinates separately
        $x_delta = calculate_distance_km($lat_min, $lng_min, $lat_max, $lng_min);
        $y_delta = calculate_distance_km($lat_min, $lng_min, $lat_min, $lng_max);
 
        // calculate the best zoom factor on the X-axis
        for ($bestX = 0; $bestX < sizeof($zoom_ranges) ; $bestX++) {
                // calculate the width of the total map in kilometers
                $total_width_km = MAP_WIDTH * $zoom_ranges[$bestX] / MAP_SCALE_IN_PIXELS;
                if ($total_width_km < $x_delta) break;
        }
 
        // calculate the best zoom factor on the Y-axis
        for ($bestY = 0; $bestY < sizeof($zoom_ranges); $bestY++) {
                // calculate the height of the total map in kilometers
                $total_height_km = MAP_HEIGHT * $zoom_ranges[$bestY] / MAP_SCALE_IN_PIXELS;
                if ($total_height_km < $y_delta) break;
        }
 
        // we want to take the minimum value, because we don't want to zoom in too far.
        $zoom_best = min($bestX, $bestY);


?><!DOCTYPE html>
<head>
<!-- add in the necessary jQuery files -->
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/themes/base/jquery-ui.css" type="text/css" media="all" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/jquery-ui.min.js" type="text/javascript"></script>
<script src="http://mapquestapi.com/sdk/js/v6.0.0/mqa.toolkit.js?key=<?php echo MAPQUEST_API_KEY; ?>"></script>
 
<script type="text/javascript">
  MQA.EventUtil.observe(window, 'load', function() {
 
  // create a new map in div#map using our calculated center and zoom factor
  window.map = new MQA.TileMap(
    document.getElementById('map'),
    <?php echo $zoom_best; ?>,
    {lat:<?php echo $center_lat; ?>, lng:<?php echo $center_lng; ?>},
    'map');
 
    // Remove the Old Zoom Control and Replace With this code to capture mouse wheel events
    MQA.withModule('zoomcontrol3','mousewheel', function() {
        map.enableMouseWheelZoom();
    });
 
    MQA.EventManager.addListener(map, 'zoomend', function(evt) {
        $("#map_zoom_slider").slider("option","value",evt.zoom);
    });
 
    // set our locations
    <?php for ($i=1; $i<=sizeof($positions); $i++) { ?>
        var basic=new MQA.Poi( {<?php echo $positions[$i-1]; ?>} );
        basic.setBias({x:-5,y:-5});
        basic.setRolloverContent('<?php echo str_replace("'", "\\'", $addresses[$i-1]); ?>');
        map.addShape(basic);
    <?php } ?>
  });
// add jquery slider info
$(function() {
        $("#map_zoom_slider").slider({
                range: "max",
                min: 1,
                max: 16,
                value: <?php echo $zoom_best; ?>,
                slide: function(event, ui) {
                        map.setZoomLevel(ui.value);
                }
        });
});
</script>
<body>
 
<div style="width: <?php echo MAP_WIDTH; ?>px; margin: 5px auto; ">
<!-- this is our map container -->
<div id="map" style="height:<?php echo MAP_HEIGHT; ?>px; width:<?php echo MAP_WIDTH; ?>px; border: 2px solid #000; "></div>
<!-- this is our slider container -->
<div id="map_zoom_slider" style="margin: 5px auto 0 auto;"></div>
 
<?php
        $num = 0;
        echo '<ol>';
        foreach ($addresses as $fa) {
                if (isset($phones[$num]) && strlen($phones[$num]) > 0) {
                        $fa .= ' &mdash; '. $phones[$num];
                }
                $num++;
                echo '<li>'. $fa . '</li>';
        }
        echo '</ol>';
?>
</div>
 
</body>
</html>