These all do the same thing, and the functionality was merged into extra/php last year:
https://aur.archlinux.org/packages/php-zendopcache https://aur.archlinux.org/packages/php-zendoptimizerplus https://aur.archlinux.org/packages/zend-optimizer https://aur.archlinux.org/packages/zend-optimizer-old
