NYCPHP Meetup

[Edward Potter]

A good starting point for all the behind the scenes code wrangling:
google maps, sql, user location, distance formulas, etc. is in this
iPhone book; can use that code as a blueprint across all languages:

Book: iPhone Cool Projects
Finally, Steven Peterson demonstrates a comprehensive integration of
iPhone technologies. He weaves Core Location, networking, XML, XPath,
and SQLite into a solid and very useful application.

http://apress.com/book/view/143022357x

Our YogaLocal app is a free DL where you can see all this in action.

Also if sticking 100% with php, this is a GREAT resource:

This tutorial is intended for developers who are familiar with
PHP/MySQL, and want to learn how to use Google Maps with a MySQL
database to create a store locator-type app. After completing this
tutorial, you will have a database of locations and a webpage that
lets a user enter their address and see markers on a map for the
locations nearest to them, within a chosen distance restriction.
http://code.google.com/apis/maps/articles/phpsqlsearch.html


On Fri, Jul 16, 2010 at 9:20 PM, Greg Rundlett (freephile)
<greg at freephile.com> wrote:
> OK, I'll bite... is the code somewhere so I can see how easy that is?
>  Didn't find it on iTunes nor the (http://www.yogalocal.com/) website.
> Greg Rundlett
>
>
>
>
> On Fri, Jul 16, 2010 at 8:29 PM, Edward Potter <edwardpotter at gmail.com>
> wrote:
>>
>> >>> Given an array of businesses with latitude/longitude coordinates, and
>> >>> the user's location, sort the array of businesses by closest to the user.
>>
>> A slight language digression:
>>
>> Oh my, if you saw how easy that was to do on an iPhone in ObjC
>> (hundreds of locations). And then visualize it all on a google map
>> with a detail view of everyone of those locations. With data updated
>> in real-time. With a 5,000 mile server round trip. And do it all in a
>> blink of the eye.
>> (plus you get to talk to 4 orbiting satellites at the same time).  Yummy!
>> :-)
>>
>> Code in action here: (dropping, sorted pins by user location 1/2 way
>> through).
>> http://www.youtube.com/watch?v=krF9IUyF3Rw
>>
>>
>> On Fri, Jul 16, 2010 at 4:36 PM, John Campbell <jcampbell1 at gmail.com>
>> wrote:
>> > On Fri, Jul 16, 2010 at 2:48 PM, Hans Zaunere <lists at zaunere.com> wrote:
>> >> Closures - great for Javascript, but for PHP?  In a
>> >> non-callback-centric
>> >> synchronous language such as PHP, what else can we use this "syntactic
>> >> sugar" for?  How are people using them and what can we gain from them?
>> >>  And,
>> >> the hell with code reuse?
>> >
>> > I have a favorite problem, that is hard/ugly to solve without closures:
>> >
>> > Given an array of businesses with latitude/longitude coordinates, and
>> > the user's location, sort the array of businesses by closest to the
>> > user.
>> >
>> > so you have:
>> >
>> > $stores = array(
>> >  array('name' => 'Pet Smart', 'lat'=>24.12, 'lon' => 54.23),
>> >  array('name' => 'Cats and Critter', 'lat'=>24.19, 'lon' => 54.32),
>> >  array('name' => 'Snakes and such', 'lat'=>24.45, 'lon' => 53.35),
>> >  array('name' => 'Lots of llams', 'lat'=>24.46, 'lon' => 54.97));
>> >
>> > $user_location = array('lat'=> 24.45, 'lon' => 54.96);
>> >
>> > // Solution using closures
>> >
>> > // geo sort.
>> > function sort_by_closest(&$points,$location) {
>> >  usort($points, function($a,$b) use($location) {
>> >    return distance($a,$location) > distance($b,$location);
>> >  });
>> > }
>> >
>> > // geo distance using sperical law of cosines.
>> > function distance($a,$b) {
>> >        $R = 6371; // km
>> >        $d2r = pi() / 180;
>> >        return acos(sin($a['lat']*$d2r)*sin($b['lat']*$d2r) +
>> >                          cos($a['lat']*$d2r)*cos($b['lat']*$d2r) *
>> >                          cos($b['lon']*$d2r-$a['lon']*$d2r)) * $R;
>> > }
>> >
>> > print_r($stores);
>> > sort_by_closest($stores,$user_location);
>> > print_r($stores);
>> >
>> >
>> > -John
>> > _______________________________________________
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>> >
>> > http://www.nyphp.org/Show-Participation
>> >
>>
>>
>>
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