Notice: Undefined variable: son in /var/www/html/zangdiyg/ti/epub/EPub.get.php on line 123

Warning: Invalid argument supplied for foreach() in /var/www/html/zangdiyg/ti/epub/EPub.get.php on line 123

Error: Unable to send file 2018.02.epub. Output buffer contains the following text (typically warnings or errors):
<br /> <b>Notice</b>: Undefined variable: son in <b>/var/www/html/zangdiyg/ti/epub/EPub.get.php</b> on line <b>123</b><br /> <br /> <b>Warning</b>: Invalid argument supplied for foreach() in <b>/var/www/html/zangdiyg/ti/epub/EPub.get.php</b> on line <b>123</b><br />