asp.net - Change CHMOD of a file in PHP for specific user -

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i have admin panel coded asp.net (c#). have textarea wordpress (redactor) , trying upload image it. using php file make upload after everytime upload image, encounter iis "401 - unauthorized: access denied due invalid credentials." error while displaying it. add 755 permission iis_iusr every timem after file upload. possible?

here php code:

    $dir = 'assets/images/content/';      $_files['file']['type'] = strtolower($_files['file']['type']);      if ($_files['file']['type'] == 'image/png'     || $_files['file']['type'] == 'image/jpg'     || $_files['file']['type'] == 'image/gif'     || $_files['file']['type'] == 'image/jpeg'     || $_files['file']['type'] == 'image/pjpeg')     {            // setting file's mysterious name         $filename = md5(date('ymdhis')).'.jpg';         $file = $dir.$filename;          // copying         move_uploaded_file($_files['file']['tmp_name'], $file);          chmod($file, 0777);          // displaying file         $array = array(             'filelink' => 'assets/images/content/'.$filename         );          echo stripslashes(json_encode($array));      }

try this: computer management (right click on computer , select manage) --> local users , groups --> users --> select iusr_machinename (ie,iusr_tomato-clownfis) --> right click properties --> make sure member of iis_wpg , users , not guests.


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