title: Does this data format have a name?
body: <p>I'm not sure what to call this: </p>
  
  <pre><code>a:2:{s:3:"Key";a:5:{i:0;s:3:"day";i:1;s:5:"month";i:2;s:4:"year";i:3;i:1912;i:4;s:4:"2012";}s:12:"ApplyDefault";s:0:"";}
  </code></pre>
  
  <p>This is what's stored in a database field for a custom field type (date of birth) in an Interspire program written in php. I can kind of figure out what's going on <code>a:2:</code> seems to mean "two properties", <code>i:0;s:3:"day";</code> means "first item, 3 character string, 'day' " ... and so on.</p>
  
  <p>Question is: what do I call this? And is it a standardized format or specific to Interspire?</p>