javascript - PHP function not getting called through ajax -

I have AJAX calls as FX function:

  $. Ajax ({url: 'link', type: 'post', datatype: 'jason', data: {'txtFromOrderDate': '2014-08-01', 'txtToOrderDate': '2014-08-05'}, success : Function () {Window.location = 'link';}});  

As a php function:

  public function createZipAction ($ txtFromOrderDate, $ txtToOrderDate) {date_default_timezone_set ('Australia / Melbourne'); $ Date = date ('m: d: y h: i: s', time ()); $ ExportBatch = $ date; $ Order = $ this- & gt; GetTableGateway ('command'); Select $ = New Select (); $ 'Select- & gt; From ('Order') - & gt; Join ('user', 'order.user_id = user.id', array ('email')) - & gt; Where ("order.created." $ .txtFromOrderDate. "And" 2014-08-03 "); // -> Where (between 'order.created' '$ TxtFromOrderDate.' And '. $ TxtToOrderDate); $ Data = $ order- & gt; Select (select $) - & gt; ToArray (); $ Batchdir = __DIR__ '/../../../../data/export/batch/' $ ExportBatch; If (is_dir ($ batchDir) == incorrect) mkdir ($ batchDir); $ CsvFile = fopen ($ batchdir. '/order.csv', 'w'); $ I = 0; Foreign currency (dollar data $ record) {if ($ i == 0) fputcsv ($ csvFile, $ this-> getCsvHeader ($ record)); Fputcsv ($ csvFile, $ this-> updatesCSYWillline ($ records)); $ PngTmpFile = $ this- & gt; Savedementimage image ($ record ['plate_id']); $ This- & gt; SavePlayPdf ($ pngTmpFile, $ exportBatch, $ record ['id']); Unlink to ($ pngTmpFile); $ I ++; } Fclose ($ csvFile); $ Filter = new \ zend \ filter \ compress (array ('adapter' = & gt; 'zip', 'option' => array ('collection' = & gt; $ batch .Dir '.zip') )); $ Filters & gt; Filter ($ batchDir); $ FileToDownload = $ batchDir '.zip'; $ This- & gt; DownloadOrderCSVAction ($ fileToDownload); The echo "has been exported: $ i record."; Die (); }  

The dates of this time are being supplied, its dates are not available.

But when I write a hard code in the PHP function:

  $ txtFromOrderDate = '2014-08-01' $ txtToOrderDate = '2014-08-05'  

then works as expected forward.

What could be the issue ???

Please help me.