Use PHP_EXT in CI.

.travis.yml

@@ -7,13 +7,13 @@ services:
 
 env:
   # Test compatiblity with opcode caches.
-  - OPCODE_CACHE=apc
-  - OPCODE_CACHE=xcache
+  - PHP_EXT=apc
+  - PHP_EXT=xcache
   # Test each database in isolation.
   - DB=mysql
   - DB=pgsql
   - DB=sqlite
-  - DB=mongodb
+  - DB=mongodb PHP_EXT=mongo
   - DB=couchdb
 
 php:

tests/ci/depends.php

@@ -7,16 +7,8 @@
  * @license       http://opensource.org/licenses/bsd-license.php The BSD License
  */
 
-$opcodeCache = getenv('OPCODE_CACHE');
-$db = getenv('DB');
-
-if ($opcodeCache == 'apc') {
-	PhpExtensions::install('apc');
-} elseif ($opcodeCache == 'xcache') {
-	PhpExtensions::install('xcache');
-}
-if ($db == 'mongodb') {
-	PhpExtensions::install('mongo');
+foreach (explode(' ', getenv('PHP_EXT')) ?: array() as $extension) {
+	PhpExtensions::install($extension);
 }
 
 /**