North, Norther and Northest

Here's a PHP example of calls to PHP methods to return the Longitude North of a place, the more northerly of two objects via an object (dynamic) method, and the most northerly of a whole array of objects via a static function.

$north = $ilike[17]->getlong();



$norther = $ilike[45]->northof($ilike[41]);



$northest = place::northmost($ilike);

To return a single longitude, we've used a property access method of the sort you'll have written a hundred times if you're an OO programmer.

To compare two objects, we've elected to run a method on one of the objects and pass the other in as the parameter; this method returns the more northerly object:

function northof($that) {

if ($this->lat > $that->lat) return $this;

return $that;}

Comparing a whole list of objects, our static method reads:

function northmost($these) {

   $sofar = $these[0];

   for ($k=1; $k
   if ($these[$k]->lat > $sofar->lat)

      $sofar = $these[$k];

   } 

   return $sofar;

}

Although this code was written and tested with PHP 5.0.5, I see no reason why these code snippets won't work in PHP 4.

See the complete application and complete classes file in our training modules area
(written 2005-11-04, updated 2010-08-14)

Associated topics are indexed under

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