How to count total number of records

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I'm not real familiar with PHRETS. RETS requires you pass in parameter Count=2 to return only the count. You can check with the PHRETS documentation on GitHub to see how to do this.

https://github.com/troydavisson/PHRETS

Keep in mind your query will be returned as a JSON array object. So you can easily COUNT the number of records within the object with code like: count($queryResults)

For Example Let's say your query is all set up and you are ready to send it to the RETS server. Once the query is completed, you simply get a COUNT of records contained in the $queryResults array variable.

$queryResults = $session->Search("Property", $propertyClass, $mlsQuery);
$recordCount = count($queryResults);