Description:
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I've noticed that some macros have been changed/added in 2.2.7 to fix PHP 5.4 compatibility but those changes were not frontported to 3.0.7, instead version checks are made in every occurrence of similar code.

zend_list_insert(mmc, le_memcache_server);

In version 2.2.7, code like this has been changed to:
MEMCACHE_LIST_INSERT(mmc, le_memcache_server);

While, in version 3.0.7, code like this has been changed to:
#if (PHP_MAJOR_VERSION == 5 && PHP_MINOR_VERSION == 3)
			zend_list_insert(mmc, le_memcache_server);
#else
			zend_list_insert(mmc, le_memcache_server TSRMLS_CC);
#endif

In my understanding code should be kept consistent with all php versions and extension branches to make fixing issues easier.

Also, there was a macro being renamed in 2.2.7, IS_CALLABLE to MEMCACHE_IS_CALLABLE, this change makes code further readable and should be frontported to version 3.0.7 or later.