For SLE 12 SP1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/server:php:extensions:php5/SLE_12_SP1/server:php:extensions:php5.repo
zypper refresh
zypper install php5-xcache
For SLE 12 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/server:php:extensions:php5/SLE_12/server:php:extensions:php5.repo
zypper refresh
zypper install php5-xcache
For SLE 11 SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/server:php:extensions:php5/SLE_11_SP4/server:php:extensions:php5.repo
zypper refresh
zypper install php5-xcache
For SLE 11 SP3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/server:php:extensions:php5/SLE_11_SP3/server:php:extensions:php5.repo
zypper refresh
zypper install php5-xcache