Fix install.sh

install.sh

@@ -100,7 +100,6 @@ while :; do
       [ -e "${php_install_dir}/bin/phpize" ] && { echo "${CWARNING}PHP already installed! ${CEND}"; php_yn=Other; }
       ;;
     --phpcache_option)
-      [[ ! ${phpcache_option} =~ ^[1-4]$ ]] && { echo "${CWARNING}phpcache_option input error! Please only input number 1~4${CEND}"; exit 1; }
       phpcache_option=$2; shift 2
       ;;
     --php_extensions)