Contributions

So simple yet so complicated!

Converting last names is not such an easy task, what about all those MacDonalds that become Macdonalds or the Hyphen-Hyphens that become the Hyphen-hyphens or the van der Capitals that become the Van Der Capitals...

Have a look at this on php.net:
http://www.php.net/manual/en/function.ucwords.php
then scroll down a bit. The contributions from the Italians are pretty comprehensive but still in the end none of them work 100%...

Mind you all is well if you are a MacDonald but there again what about the Macallisters who then become the MacAllisters!

Thanks to the OP and others for adding to this. I was looking for just this modification and low and behold it's a simple change. There are several modules that need to be modified (those already mentioned below plus checkout_shipping_address.php) to catch all the places where a user might make a change to his name and address.

In addition to the name I also include the fields to proper case the street, city and state.

Here's the list of modules to update:
checkout_shipping_address.php
address_book_process.php
account_edit.php
create_account.php

Here's the code I added (note I added this below where all the current code is, right after then state and county code is:
$firstname = ucwords($firstname);
$lastname = ucwords(strtolower($lastname));
$street_address = ucwords(strtolower($street_address));
$city = ucwords(strtolower($city));
$state = strtoupper($state);

Note for account_edit.php you only need the first and last name.

In order for this to be complete you also should add the ucwords to the appropriate location inside of account_edit.php and address_book_process.php as well.

A nifty little tip from phi148

It only seemed to work for the first name only, so I had to add the code to
the last name also.

In catalog/create_account

Around line 23 change this:

$firstname = tep_db_prepare_input($HTTP_POST_VARS['firstname']);


$lastname = tep_db_prepare_input($HTTP_POST_VARS['lastname']);

to this:

$firstname = tep_db_prepare_input($HTTP_POST_VARS['firstname']);
$firstname = ucwords(strtolower($firstname));


$lastname = tep_db_prepare_input($HTTP_POST_VARS['lastname']);
$lastname = ucwords(strtolower($lastname));

To also get rid of those annoying ALL CAPS entries, use this:

$firstname = ucwords(strtolower($firstname))

This may be the simplest contribution ever. Many of our customers were to lazy to capitalize the first letter of the following fields :

First Name
Last Name
City
Business Name
Street Address

This drove me crazy, so, I fixed this for them on the fly using the ucwords() function.

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Example from create_account.php

To capitalize the first letter of the "first name" field:

FIND :

$firstname = tep_db_prepare_input($HTTP_POST_VARS['firstname']);

CHANGE TO :

$firstname = tep_db_prepare_input($HTTP_POST_VARS['firstname']);
$firstname = ucwords($firstname);

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Done! Simply do that for any field you wish to capitalize for your customers.