Synopsis

require 'FindMyNearest.php';

$fmn = FindMyNearest::factory('textfile', array('datafile' => 'postcodes.txt'));

if (! $fmn->loaddata()) {
  echo "Error loading data: " . $fmn->lasterror() . "\n";
  exit;
}

$goodcode = $fmn->validcode('SW1A 1AA');    // Check if we know about a code

$distance = $fmn->calc_distance('SW1A 1AA', 'CV32 5HZ'); // calculate distance

if ($distance === false) {
  echo "The was an error " . $fmn->lasterror();
}