Fixed #471 // "Fallback must be a boolean" error

src/phpFastCache/CacheManager.php

@@ -481,8 +481,8 @@ protected static function validateConfig(array $config)
                     }
                     break;
                 case 'fallback':
-                    if(!is_bool($configValue)){
-                        throw new phpFastCacheInvalidConfigurationException("{$configName} must be a boolean");
+                    if(!is_bool($configValue) && !is_string($configValue)){
+                        throw new phpFastCacheInvalidConfigurationException("{$configName} must be a boolean or string");
                     }
                     break;
                 case 'limited_memory_each_object':

tests/issues/Github-471.test.php

@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * @author Khoa Bui (khoaofgod)  <khoaofgod@gmail.com> http://www.phpfastcache.com
+ * @author Georges.L (Geolim4)  <contact@geolim4.com>
+ */
+
+use phpFastCache\CacheManager;
+use phpFastCache\Drivers\Files\Driver as FilesDriver;
+use phpFastCache\Helper\TestHelper;
+
+chdir(__DIR__);
+require_once __DIR__ . '/../../src/autoload.php';
+$testHelper = new TestHelper('Github issue #471 - Fallback must be a boolean');
+CacheManager::setDefaultConfig(['path' => __DIR__ . '/../../cache']);
+
+/**
+ * Catch the E_USER_WARNING for the tests
+ */
+set_error_handler(function($errno, $errstr, $errfile, $errline, array $errcontext) use($testHelper) {
+    if (0 === error_reporting()) {
+        return false;
+    }
+
+    if($errno === E_USER_WARNING){
+        define('E_USER_WARNING_RAISED', true);
+    }else{
+        $testHelper->printFailText('A unknown error (' . $errno . ') has been catched while the fallback driver got used.');
+    }
+});
+
+$cacheInstance = CacheManager::getInstance('Cassandra', ['fallback' => 'Files']);
+
+if(defined('E_USER_WARNING_RAISED')){
+    $testHelper->printPassText('A E_USER_WARNING error has been catched while the fallback driver got used.');
+}else{
+    $testHelper->printFailText('No E_USER_WARNING were thrown while the fallback driver got used.');
+}
+
+if($cacheInstance instanceof FilesDriver){
+    $key = 'test';
+    $cacheItem = $cacheInstance->getItem($key);
+    $cacheItem->set('value');
+    $cacheInstance->save($cacheItem);
+    $testHelper->printPassText('The variable $cacheInstance is an expected instance of FilesDriver');
+}else if(is_object($cacheInstance)){
+    $testHelper->printFailText(sprintf('The variable $cacheInstance is an expected instance of "%s"', get_class($cacheInstance)));
+}else{
+    $testHelper->printFailText(sprintf('The variable $cacheInstance is an expected variable type "%s"', gettype($cacheInstance)));
+}
+
+$testHelper->terminateTest();