PHP/mySQL Zip Code Distance Locator

**amiecutie** · July 9th, 2012, 05:46 PM

So I've been working on a page to locate shops based on zip code and mile distance. I used this tutorial as a walk-through http://htmlcampus.com/build-a-zip-co...cation-in-php/

Now I've changed a couple of things like the mySQL table is called locations instead of zip_codes. I've tested it and it connects to the database and all, but it just says that no results were found, even when I enter in an exact zip code of one of the shops (90278 or 92602).

Below is my code for the page (password left out). I hope someone could spot what might be wrong, something I missed.

Code:

<?php

// Create page variables
$r = NULL;
$z = NULL;
$shops = NULL;
$Errors = NULL;

// Establish DB connection
mysql_connect ('localhost', 'acq-admin', 'password') or die(mysql_error());
mysql_select_db ('atrs') or die(mysql_error());

// Declare page functions
function Dist ($lat_A, $long_A, $lat_B, $long_B) {

  $distance = sin(deg2rad($lat_A))
      * sin(deg2rad($lat_B))
      + cos(deg2rad($lat_A))
      * cos(deg2rad($lat_B))
      * cos(deg2rad($long_A - $long_B));

  $distance = (rad2deg(acos($distance))) * 69.09;
  return $distance;

}

### Handle form if submitted
if (isset ($_POST['submitted'])) {

  // Validate Zip code field
  if (!empty ($_POST['zip']) && is_numeric ($_POST['zip'])) {

    $z = (int)$_POST['zip'];

    // Verify zip code exists
    $query = "SELECT lat, lon FROM locations WHERE zip = '$z'";
    $result = mysql_query ($query);

    if (mysql_num_rows ($result) == 1) {
      $zip = mysql_fetch_assoc ($result);
    } else {
      $Errors = '<p>The zip code you entered was not found!</p>';
    }

  }

  // Validate radius field
  if (isset ($_POST['radius']) && is_numeric ($_POST['radius'])) {
    $r = (int)$_POST['radius'];
  }

  // Proceed if no errors were found
  if ($r && $z) {

    // Retrieve coordinates of the shops
    $shops = array();
    $query = "SELECT name, address, city, state, zip, phone, lat, lon
    FROM dealerships
    INNER JOIN locations
    ON dealerships.zip = locations.zip";
    $result = mysql_query ($query);

    // Go through and check all shops
    while ($row = mysql_fetch_assoc ($result)) {

      // Separate closest shops
      $distance = Dist ($row['lat'], $row['lon'], $zip['lat'], $zip['lon']);

      // Check if shop is in radius
      if ($distance <= $r) {

        $shops[] = array (
          'name'      => $row['name'],
          'address'   => $row['address'],
          'state'     => $row['state'],
          'city'      => $row['city'],
          'zip'       => $row['zip'],
          'phone'     => $row['phone']
        );

      }

    }

  } else {
    $Errors = ($Errors) ? $Errors : '<p>Errors were found please try again!</p>';
  }

}

?><html>
<head>
<title>Pick Your Shop</title>
</head>
<body>
<form action="" method="post">
  <p>Enter your zip code below to find the nearest shop</p>
  <?php echo ($Errors) ? $Errors : ''; ?>
  <div>
    <label>Zip:</label>
    <input name="zip" type="text" size="10" maxlength="5" />
  </div>
  <div>
    <label>Search Area:</label>
    <select name="radius" id="radius">
      <option value="5">5 mi.</option>
      <option value="10">10 mi.</option>
      <option value="15">15 mi.</option>
      <option value="20">20 mi.</option>
    </select>
  </div>
  <div>
    <input type="hidden" name="submitted" value="submitted" />
    <input type="submit" value="Submit" />
  </div>
</form>

<?php

if (isset ($shops)) {

  if (!empty ($shops)) {

    echo '<p><strong>' . count ($shops) . ' results were found.</strong></p>';
    foreach ($shops as $value) {

      echo '<p><strong>' . $value['name'] . '</strong><br />';
      echo $value['address'] . '<br />';
      echo $value['city'] . ', ' . $value['state'] . ' ' . $value['zip'];
      echo '&nbsp;<a target="_blank" href="http://maps.google.com/maps?q=',
      $value['address'], ' ',
      $value['city'], ', ',
      $value['state'], ' ',
      $value['zip'],
      '">Map this location</a><br />';
      echo 'Phone: ' . $value['phone'];
      echo '</p>';

    }

  } else {
    echo '<p><strong>No results found</strong></p>';
    echo '<p><strong>' . $z . '</strong><br />';
  }

}

?>
</body>
</html>

**PeejAvery** · July 11th, 2012, 07:02 AM

Does it work if you change it back to "zip_codes" and the code that you changed along with that? If so...then you're simply missing a reference to "zip_codes".

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