Hi Etienne, I am not 100% certain of the PHP equivalent since I focus primarily on Java, but I will help as best I can. I believe that for *Lib\Util\ReportUtils.DownloadReport *for the PHP example <https://github.com/googleads/googleads-php-lib/blob/master/examples/AdWords/v201509/Reporting/DownloadCriteriaReportWithAwql.php#L66>, the return type is "if path isn't specified the contents of the report, otherwise the size in bytes of the downloaded report". In other words, if you do not provide the file path, it will be returned as a string.
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