Unknowingly, now Zend Guard Loader released the 6.0.0 version, supporting the PHP 5.4.x series.
Official address: Http://www.zend.com/en/products/guard/downloads (need to register users after download)
Here are the most common versions available
Windows:
Accessories: zendguardloader-70429-php-5.4-windows-x86
Attachment (Backup): HTTP://BLOG.ICH8.COM/FILE/68
Linux:
32 Guests
Accessories: Zendguardloader-70429-php-5.4-linux-glibc23-i386.tar
Attachment (Backup): http://blog.ich8.com/file/69
64 guests
Accessories: Zendguardloader-70429-php-5.4-linux-glibc23-x86_64.tar
Attachment (Backup): HTTP://BLOG.ICH8.COM/FILE/70
Attached (Windows version):
[Zend.loader]
Zend_extension=x:\zendguardloader\php-5.4.x\zendloader.dll
Zend_loader.enable=1
Zend_loader.disable_licensing=0
Zend_loader.obfuscation_level_support=3
Zend_loader.license_path=
Attached (Linux version):
Zend_extension=/usr/lib64/php/modules/zendguardloader.so
Zend Guard Loader 6.0.0 support PHP 5.4.x series