add memcache.so only for php 5.x

Author: zkiiito

.travis.yml

@@ -33,7 +33,7 @@ install:
 
 before_script:
     - sh -c 'if [ $(php -r "echo PHP_MINOR_VERSION;") -le 4 ] && [ $(php -r "echo PHP_MAJOR_VERSION;") -le 5 ]; then echo "extension = apc.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi;'
-    - echo "extension = memcache.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
+    - sh -c 'if [ $(php -r "echo PHP_RELEASE_VERSION;") -le 98 ] && [ $(php -r "echo PHP_MAJOR_VERSION;") -le 5 ]; then echo "extension = memcache.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi;'
     - composer install
 
 script: