If customer get blank page on php script which caused by pear missing file, see error_log
You will get
[09-Apr-2014 13:29:56 UTC] PHP Warning: require_once(Mail.php): failed to open stream: No such file or directory in /home/bazichic/public_html/_inc/appLayer.php on line 6
[09-Apr-2014 13:29:56 UTC] PHP Fatal error: require_once(): Failed opening required 'Mail.php' (include_path='.:/opt/alt/php54/usr/share/pear:/opt/alt/php54/usr/share/php') in /home/bazichic/public_html/_inc/appLayer.php on line 6
/opt/alt/php54/usr/share/php >> This one means customer is using PHP 5.4 in PHP Selector
So now you want to install the pear MAIL to the selector folder
Run below (becareful of the php54, it can be php52 depending on php version)
/opt/alt/php54/usr/bin/pear install Mail
After that, update cagefs skeleton directory
cagefsctl --force-update
done.
Another common libary is Mail/mime.php
Then run
/opt/alt/php54/usr/bin/pear install Mail_mail
You can check the packages from http://pear.php.net/index.php
