I'm creating some analytics script using PHP and MongoDB and I am a bit stuck. I would like to get the unique number of visitors per day within a certain time frame.
{
"_id": ObjectId("523768039b7e7a1505000000"),
"ipAddress": "127.0.0.1",
"pageId": ObjectId("522f80f59b7e7a0f2b000000"),
"uniqueVisitorId": "0445905a-4015-4b70-a8ef-b339ab7836f1",
"recordedTime": ISODate("2013-09-16T20:20:19.0Z")
}
The field to filter on is uniqueVisitorId and recordedTime.
I've created a database object in PHP that I initialise and it makes me a database connection when the object is constructed, then I have MongoDB php functions simply mapped to public function using the database connection created on object construction.
Anyhow, so far I get the number of visitors per day with:
public function GetUniqueVisitorsDiagram() {
// MAP
$map = new MongoCode('function() {
day = new Date(Date.UTC(this.recordedTime.getFullYear(), this.recordedTime.getMonth(), this.recordedTime.getDate()));
emit({day: day, uniqueVisitorId:this.uniqueVisitorId},{count:1});
}');
// REDUCE
$reduce = new MongoCode("function(key, values) {
var count = 0;
values.forEach(function(v) {
count += v['count'];
});
return {count: count};
}");
// STATS
$stats = $this->database->Command(array(
'mapreduce' => 'statistics',
'map' => $map,
'reduce' => $reduce,
"query" => array(
"recordedTime" =>
array(
'$gte' => $this->startDate,
'$lte' => $this->endDate
)
),
"out" => array(
"inline" => 1
)
));
return $stats;
}
How would I filter this data correctly to get unique visitors? Or would it better to use aggregation, if so could you be so kind to help me out with a code snippet?