Before you dive into the PHP code, a few words about the Google Calendar Data API are in order. As with all REST-based services, the API works by accepting HTTP requests containing one or more XML-encoded input arguments and returning XML-encoded responses that can be parsed in any XML-aware client. With the Google Calendar Data API, the response always consists of an Atom or RSS feed containing the requested information.
A typical Google Calendar feed includes more than enough information to build a useful and relevant application. To see an example, log into your Google Calendar account, navigate to your calendar settings, and find the link for your calendar's private address URL. This URL, which you should hold secret at all times, provides read-only access to your calendar's feed without first requiring authorization, and will look something like
http://www.google.com/calendar/feeds/userid/private-magicCookie/basic. Pop this URL into your Web browser (or send a GET request for the feed through an HTTP client), and you should see something like Listing 1 :Listing 1: An example Google Calendar feed
<?xml version='1.0' encoding='UTF-8'?>
<feed xmlns='http://www.w3.org/2005/Atom'
xmlns:openSearch='http://a9.com/-/spec/opensearchrss/1.0/'
xmlns:batch='http://schemas.google.com/gdata/batch'
xmlns:gCal='http://schemas.google.com/gCal/2005'
xmlns:gd='http://schemas.google.com/g/2005'>
<id>http://www.google.com/calendar/feeds/user@gmail.com/
private-cookie/basic</id>
<updated>2008-06-13T19:15:18.000Z</updated>
<category scheme='http://schemas.google.com/g/2005#kind'
term='http://schemas.google.com/g/2005#event'/>
<title type='text'>Joe User</title>
<subtitle type='text'>Joe User</subtitle>
<link rel='alternate' type='text/html'
href='http://www.google.com/calendar/embed?src=user@gmail.com'/>
<link rel='http://schemas.google.com/g/2005#feed' type='application/atom+xml'
href='http://www.google.com/calendar/feeds/user@gmail.com/private-cookie/basic'/>
<link rel='http://schemas.google.com/g/2005#batch' type='application/atom+xml'
href='http://www.google.com/calendar/feeds/user@gmail.com/private-cookie/basic/batch' />
<link rel='self' type='application/atom+xml'
href='http://www.google.com/calendar/feeds/user@gmail.com/private-cookie/basic?
max-results=25'/>
<author>
<name>Joe User</name>
<email>user@gmail.com</email>
</author>
<generator version='1.0' uri='http://www.google.com/calendar'
>Google Calendar</generator>
<openSearch:totalResults>4</openSearch:totalResults>
<openSearch:startIndex>1</openSearch:startIndex>
<openSearch:itemsPerPage>25</openSearch:itemsPerPage>
<gCal:timezone value='Asia/Calcutta'/>
<entry>
<id>http://www.google.com/calendar/feeds/user@gmail.com/
private-cookie/basic/xxxxxxxx</id>
<published>2008-06-12T08:49:38.000Z</published>
<updated>2008-06-13T19:06:21.000Z</updated>
<category scheme='http://schemas.google.com/g/2005#kind'
term='http://schemas.google.com/g/2005#event'/>
<title type='html'>Swim party</title>
<summary type='html'>When: Sat Jun 21, 2008 12pm to 3:30pm
IST<br>
<br>Event Status: confirmed</summary>
<content type='html'>When: Sat Jun 21, 2008 12pm to 3:30pm
IST<br />
<br />Event Status: confirmed</content>
<link rel='alternate' type='text/html'
href='http://www.google.com/calendar/event?eid=cGxwbHExOYHHDlOHQ4ZjA
yMGMgdmlrcmFtLm1lbG9uZmlyZUBnb29nxmNvbQ' title='alternate'/>
<link rel='self' type='application/atom+xml'
href='http://www.google.com/calendar/feeds/user@gmail.com/
private-cookie/basic/ddddddddddddddd/>
<author>
<name>Joe User</name>
<email>user@gmail.com</email>
</author>
</entry>
<entry>
<id>http://www.google.com/calendar/feeds/user@gmail.com/
private-cookie/basic/yyyyyyyyyyyyyyyy</id>
<published>2008-06-12T08:48:30.000Z</published>
<updated>2008-06-12T08:48:46.000Z</updated>
<category scheme='http://schemas.google.com/g/2005#kind'
term='http://schemas.google.com/g/2005#event'/>
<title type='html'>Dinner with the gang</title>
<summary type='html'>When: Wed Jun 11, 2008 7pm to 9:30pm
IST<br>
<br>Event Status: confirmed</summary>
<content type='html'>When: Wed Jun 11, 2008 7pm to 9:30pm
IST<br />
<br />Event Status: confirmed</content>
<link rel='alternate' type='text/html'
href='http://www.google.com/calendar/event?eid=
MmhpYmV2cmowMM2kam9lZDQgdcmFtLm1lbG9uZmlyZU4858Bnb29nbGVtYWlsLmNvbQ'
title='alternate'/>
<link rel='self' type='application/atom+xml'
href='http://www.google.com/calendar/feeds/user@gmail.com/private-cookie/
basic/hhhhhhhhhhhhhhhhh'/>
<author>
<name>Joe User</name>
<email>user@gmail.com</email>
</author>
</entry>
<entry>
...
</entry>
</feed>
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