pg_close was undefining default_conn even if a ref to it was still there.

ext/pgsql/pgsql.c

@@ -501,7 +501,8 @@ PHP_FUNCTION(pg_pconnect)
 PHP_FUNCTION(pg_close)
 {
 	zval **pgsql_link = NULL;
-	int id;
+	void *ptr;
+	int id, type;
 	PGconn *pgsql;
 	PGLS_FETCH();
 	
@@ -527,12 +528,15 @@ PHP_FUNCTION(pg_close)
 
 	if (id==-1) { /* explicit resource number */
 		zend_list_delete(Z_RESVAL_PP(pgsql_link));
+		ptr = zend_list_find(Z_RESVAL_PP(pgsql_link),&type);
+		if (ptr && (type==le_link || type==le_plink)) {
+			RETURN_TRUE;
+		}                
 	}
 
 	if (id!=-1 
 		|| (pgsql_link && Z_RESVAL_PP(pgsql_link)==PGG(default_link))) {
-		if (id!=-1)
-			zend_list_delete(PGG(default_link));
+		zend_list_delete(PGG(default_link));
 		PGG(default_link) = -1;
 	}