Fix FLOAT error when TIMEOUT is null on Redis 6.x

Author: hungnguyenhp

system/libraries/Cache/drivers/Cache_redis.php

@@ -60,7 +60,8 @@ class CI_Cache_redis extends CI_Driver
 		'host' => '127.0.0.1',
 		'password' => NULL,
 		'port' => 6379,
-		'timeout' => 0
+		'timeout' => 0.0,
+		'database' => 0
 	);
 
 	/**

system/libraries/Session/drivers/Session_redis_driver.php

@@ -157,7 +157,7 @@ public function __construct(&$params)
 			{
 				$save_path['password'] = preg_match('#auth=([^\s&]+)#', $matches['options'], $match) ? $match[1] : NULL;
 				$save_path['database'] = preg_match('#database=(\d+)#', $matches['options'], $match) ? (int) $match[1] : NULL;
-				$save_path['timeout']  = preg_match('#timeout=(\d+\.\d+)#', $matches['options'], $match) ? (float) $match[1] : NULL;
+				$save_path['timeout']  = preg_match('#timeout=(\d+\.\d+)#', $matches['options'], $match) ? (float) $match[1] : 0.0;
 
 				preg_match('#prefix=([^\s&]+)#', $matches['options'], $match) && $this->_key_prefix = $match[1];
 			}