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Zip Code Function

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I have a zip code function that returns a zipcode and if the zipcode starts with a 0 it chops the 0 off of the front. I integrated this into someone else's system and am not sure how to force the 0 on the front to stay I am using number ranges when I do this for example...

If your zip code is between 00000 and 00300 then your cost is $20 and if it is between 00301 and 03000 then its $30. If anyone knows how to force the 0 please let me know.


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For comparison purposes, it's best to treat the zip code as a numeric value. So, that means leading zeros are irrelevant (00300 and 300 are the same thing).

You could use an array to hold all your ranges. See example code below. I used another array to hold the actual dollar amount. This makes it easier if there's zip ranges that will end up having the same dollar amount. You could simply replace the 'CA' and 'NV' values in the $zip_rates with the dollar amounts (and change the code accordingly). I used state codes, but it can be any alphanumeric value as long as it corresponds to the associative array index in the $zip_charges array.

This approach is not bad to implement because changes to zip ranges or charges can be done without having to change the main lookup code logic.

You could save the array part in an include file or even put that data in a file (or DB) and have it be read in instead.

$zip_rates = array(array('min' => 0, 'max' => 300, 'rate' => 'CA'),
                   array('min' => 301, 'max' => 3000, 'rate' => 'NV')

$zip_charges = array('CA' => 20.00,
                     'NV' => 30.00

$zip = (int) 500;  // from DB or form input - just an example

$charge = (float) 0;  // Initialize
for ($i = 0, $cnt = count($zip_rates); $i < $cnt; $i++) {

    if (($zip >= $zip_rates[$i]['min']) &&
        ($zip <= $zip_rates[$i]['max'])) {
        $charge = $zip_charges[$zip_rates[$i]['rate']];
        break;   // found rate so get out of loop

echo "For zip $zip the charge is \$$charge <br/>";

For zip 500 the charge is $30

intval() function:
[a href=\"http://us2.php.net/manual/en/function.intval.php\" target=\"_blank\"]http://us2.php.net/manual/en/function.intval.php[/a]

Type casting:
[a href=\"http://us2.php.net/manual/en/language.types.type-juggling.php#language.types.typecasting\" target=\"_blank\"]http://us2.php.net/manual/en/language.type...pes.typecasting[/a]

str_pad() function:
[a href=\"http://us2.php.net/manual/en/function.str-pad.php\" target=\"_blank\"]http://us2.php.net/manual/en/function.str-pad.php[/a]


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