Batch download of audio for 1000+ CDRs

Example is for download all audio from CDRs where caller number starts with 0012345 and call started in time range 2019-01-01 00:00:00 - 2019-02-01 00:00:00) (beware that script not tests errors in paths credentials etc - jsut outputs which file is currently processed and total of observed CDRs to process)

<?php
$guiDir="/var/www/html";
$batchDir="/backup/batch";
$user="myGuiUser";
$pass="myGuiPass";
exec('echo \'{"task": "getVoipCalls", "user": "'.$user.'", "password": "'.$pass.'", "params": {"startTime": "2019-01-01 00:00:00", "startTimeTo": "2019-02-01 00:00:00","caller": "0012345%", "onlyConnected": "1"}}\' | php '.$guiDir.'/php/api.php',$ret,$rv);
if (!$rv) {
       $tmpres=(json_decode($ret[0]));
       foreach($tmpres->cdr as $record) {
               $results[]=$record->cdrId;
       }
       $items=count($results);

       foreach ($results as $n => $result) {
               echo ("processing CDRid $result   ".($n+1)."/$items\n");
               exec ('echo \'{"task": "getVoiceRecording", "user": "'.$user.'", "password": "'.$pass.'", "params": {"cdrId": "'.$result.'"}}\' | php '.$guiDir.'/php/api.php > '.$batchDir.'/'.$result.'.wav',$ret2,$rv2);
       }
}
?>