This downloads the scheduled report from Zendesk and saves it to the local server.

report-csv-dl-zendesk.php

<?php
/*********************************************************************************
** This waits for the Zendesk Schedule report call and then downloads the       **
** file your Local server for you to act on with other functions or programs    **
*********************************************************************************/


$xmlDoc = new DOMDocument();

//Reads the POST from Zendesk
$encodedMessage = file_get_contents("php://input");
//loads the XML
$xmlDoc->loadXML($encodedMessage);
//gets the URL from the Zendesk XML callback
$url = $xmlDoc->getElementsByTagName("url")->item(0)->nodeValue;

//give it a admins user name and password to download it
$username = 'youradmin@your.zendesk.com';
$password = 'apassword';

//Grabs the path name, splits for the file name
$csvName = parse_url($url, PHP_URL_PATH);
$csvNamePath = explode('/', $csvName);
$pathCSVsize = sizeof($csvNamePath)-1;
$csvFileName = $csvNamePath[$pathCSVsize];


transport($url, $username, $password, $csvFileName);

//takes the url and file name downloads to your local server 
        function transport($url, $username, $password, $csvFileName)
        {                       
                $cobj = curl_init();
                $csvContent = fopen($csvFileName,'w');
                curl_setopt($cobj, CURLOPT_SSL_VERIFYPEER, FALSE);
                curl_setopt($cobj, CURLOPT_USERPWD, $username .":".$password);
                curl_setopt($cobj, CURLOPT_URL, $url);
                curl_setopt($cobj, CURLOPT_FOLLOWLOCATION, false);
                //curl_setopt($cobj, CURLOPT_HEADER, true);
                curl_setopt($cobj, CURLOPT_FILE, $csvContent);
                //$last_http_result = curl_exec($cobj);
                //$last_error       = curl_error($cobj);
                //$last_http_code   = curl_getinfo($cobj ,CURLINFO_HTTP_CODE);
				
                curl_exec($cobj);
                curl_close($cobj);
                
                unzipZendeskCSV($csvFileName);
                //print $last_http_result."\n";
                //print $last_error."\n";
                //print $last_http_code."\n";
        }

//Unzips the CSV
	function unzipZendeskCSV($reportName)
        {     
              $unzipReport = new ZipArchive;
              $unzipReport->open($reportName);
              //where to extract the report to 
              $unzipReport->extractTo('/var/www/reports/');
              $unzipReport->close();
        }

exit;

?>

I removed the code that set the headers to .zip as they appeared to be causing issues with this code not working correctly.