function str_replace_last( $search, $replace, $subject ) {
    if ( !$search || !$replace || !$subject )
        return false;

    $index = strrpos( $subject, $search );
    if ( $index === false )
        return $subject;

    // Grab everything before occurence
    $pre = substr( $subject, 0, $index );

    // Grab everything after occurence
    $post = substr( $subject, $index );

    // Do the string replacement
    $post = str_replace( $search, $replace, $post );

    // Recombine and return result
    return $pre . $post;
}

Hope someone else finds this useful.

What I ended up doing is using the Yahoo! GeoPlanet API. This allowed me to do a query of my city or state name and get a place resource, then use that to find the continent that the place resource belongs to.

So first things first, you’re going to need an app id from Yahoo!, so if you don’t already have one you’ll need to get one. Then you just need to make a request like the following:
http://where.yahooapis.com/v1/places.q(CITY_OR_STATE)?appid=YOUR_APP_ID
Where CITY_OR_STATE is the query term you’re searching for and YOUR_APP_ID is the Yahoo! app id from above. Then you’ll get back something like the following:

<places xmlns="http://where.yahooapis.com/v1/schema.rng" xmlns:yahoo="http://www.yahooapis.com/v1/base.rng" yahoo:start="0" yahoo:count="1" yahoo:total="300">
<place yahoo:uri="http://where.yahooapis.com/v1/place/2488042" xml:lang="en-US">
<woeid>2488042</woeid>
<placeTypeName code="7">Town</placeTypeName>
<name>San Jose</name>
<country type="Country" code="US">United States</country>
<admin1 type="State" code="US-CA">California</admin1>
<admin2 type="County" code="">Santa Clara</admin2>
<admin3/>
<locality1 type="Town">San Jose</locality1>
<locality2/>
<postal/>
<centroid>
<latitude>37.338470</latitude>
<longitude>-121.885788</longitude>
</centroid>
<boundingBox>
<southWest>
<latitude>37.117840</latitude>
<longitude>-122.160027</longitude>
</southWest>
<northEast>
<latitude>37.555859</latitude>
<longitude>-121.535393</longitude>
</northEast>
</boundingBox>
<areaRank>6</areaRank>
<popRank>12</popRank>
</place>
</places>

You want to grab the woeid (in this case 2488042) for the next part. Next, we need to lookup the continent this place resource belongs to. To do this we make a request like so:
http://where.yahooapis.com/v1/place/THE_WOEID/belongtos.type(29)?appid=YOUR_APP_ID
Where THE_WOEID is the woeid we found in the last step (2488042 in this example) and YOUR_APP_ID is your app id again. This should return something like the following:

<places xmlns="http://where.yahooapis.com/v1/schema.rng" xmlns:yahoo="http://www.yahooapis.com/v1/base.rng" yahoo:start="0" yahoo:count="1" yahoo:total="1">
<place yahoo:uri="http://where.yahooapis.com/v1/place/24865672" xml:lang="en-US">
<woeid>24865672</woeid>
<placeTypeName code="29">Continent</placeTypeName>
<name>North America</name>
</place>
</places>

Where North America is clearly what we want to pull out of it.

I was doing this in PHP, so here’s a quick and dirty PHP example:

function continent_lookup( $search ) {
    if ( strlen( $search ) == 0 )
        return false;

    $search = urlencode( $search );

    $app_id = 'YOUR_APP_ID';

    $res = file_get_contents( "http://where.yahooapis.com/v1/places.q($search)?appid=$app_id" );
    preg_match( "/<woeid>([0-9]+?)<\/woeid>/", $res, $match );

    if ( !$match )
        return false;

    $woeid = $match[1];

    $res = file_get_contents( "http://where.yahooapis.com/v1/place/$woeid/belongtos.type(29)?appid=$app_id" );
    preg_match( "/<name>(.+?)<\/name>/", $res, $match );

    return $match[1];
}

Hope this helps someone else out there. Let me know if you have any feedback.

function png_has_transparency( $filename ) {
    if ( strlen( $filename ) == 0 || !file_exists( $filename ) )
        return false;

    if ( ord ( file_get_contents( $filename, false, null, 25, 1 ) ) & 4 )
        return true;

    $contents = file_get_contents( $filename );
    if ( stripos( $contents, 'PLTE' ) !== false && stripos( $contents, 'tRNS' ) !== false )
        return true;

    return false;
}

The first file check:
ord ( file_get_contents( $filename, false, null, 25, 1 ) ) & 4
will check for transparency in a 32-bit PNG. The second check
stripos( $contents, 'PLTE' ) !== false && stripos( $contents, 'tRNS' ) !== false
works to detect transparency in 8-bit PNG’s. Big thanks to this article which expains how these parts work in a bit more detail.

Depending on how likely you are to have transparency (or 32-bit png’s) you might want to modify this function to only do one file access, but the advantage here is that if it is a 32-bit png with transparency we only need to read in part of the file. This was faster in my early testing of a sample of our images, but your results may vary.

Hope this helps someone else out there.

The interesting part of it, though, is that the emails all dump to a PHP script.  This script looks at the email address it was sent to, and checks a database to see if that email address has been seen before or not.  If it hasn’t, it will forward that email to my “real” email address.  If it has, it will ignore it.

This has been super helpful when making test accounts on services too as it’s easy to get another email address, but I don’t have to worry about checking a weird email account or getting a bunch of spam afterwards.  Just thought I’d mention it in case anyone else out there does a lot of this stuff.

Once you’ve got the command installed you can lookup PHP functions by simply opening Ubiquity (CTRL+SPACE) and typing “php [function]“. This one was pretty simple to do, but very useful already. I look up syntax for PHP functions several times a day and saving my “Google step” is really nice.

Let me know what you think.