Reduce compilation noise during normal compilation:

    php-5.5/ext/session/session.c:836: warning: unused variable ‘struc’
    php-5.5/ext/session/session.c:836: warning: unused variable ‘num_key’
    php-5.5/ext/session/session.c:836: warning: unused variable ‘key_length’
    php-5.5/ext/session/session.c:836: warning: unused variable ‘key’
    php-5.5/ext/session/session.c:835: warning: unused variable ‘key_type’
    php-5.5/ext/session/session.c:834: warning: unused variable ‘_ht’
    php-5.5/ext/session/session.c:857: warning: unused variable ‘has_value’
    php-5.5/ext/session/session.c:856: warning: unused variable ‘namelen’
    php-5.5/ext/session/session.c:853: warning: unused variable ‘name’
    php-5.5/ext/session/session.c:852: warning: unused variable ‘p’

    php-5.5/ext/session/mod_user.c:191: warning: unused variable ‘ret’

ext/session/mod_user.c

@@ -188,7 +188,7 @@ PS_CREATE_SID_FUNC(user)
 	/* maintain backwards compatibility */
 	if (PSF(create_sid) != NULL) {
 		char *id = NULL;
-		STDVARS;
+		zval *retval = NULL;
 
 		retval = ps_call_handler(PSF(create_sid), 0, NULL TSRMLS_CC);
 

ext/session/session.c

@@ -831,9 +831,6 @@ PS_SERIALIZER_ENCODE_FUNC(php_serialize) /* {{{ */
 {
 	smart_str buf = {0};
 	php_serialize_data_t var_hash;
-	HashTable *_ht = Z_ARRVAL_P(PS(http_session_vars));
-	int key_type;
-	PS_ENCODE_VARS;
 
 	PHP_VAR_SERIALIZE_INIT(var_hash);
 	php_var_serialize(&buf, &PS(http_session_vars), &var_hash TSRMLS_CC);
@@ -849,12 +846,8 @@ PS_SERIALIZER_ENCODE_FUNC(php_serialize) /* {{{ */
 
 PS_SERIALIZER_DECODE_FUNC(php_serialize) /* {{{ */
 {
-	const char *p;
-	char *name;
 	const char *endptr = val + vallen;
 	zval *session_vars;
-	int namelen;
-	int has_value;
 	php_unserialize_data_t var_hash;
 
 	PHP_VAR_UNSERIALIZE_INIT(var_hash);