Invalid path check is_dir tmp file delete

[kamilzamerski]

Line 8354 mpdf.php

if (($file != "..") && ($file != ".") && !is_dir($file) && ((filemtime(_MPDF_TEMP_PATH.$file)+$interval) < time()) && (substr($file, 0, 1) !== '.') && ($file !='dummy.txt')) { // mPDF 5.7.3

Invalid is_dir check file, there is no have path of this file/dir so it always return false, it must by like this:

if (($file != "..") && ($file != ".") && !is_dir(_MPDF_TEMP_PATH.$file) && ((filemtime(_MPDF_TEMP_PATH.$file)+$interval) < time()) && (substr($file, 0, 1) !== '.') && ($file !='dummy.txt')) { // mPDF 5.7.3

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