Be compatible with Redis::open() and fix Travis CI

Author: Bob Chengbin

.travis.yml

@@ -10,12 +10,12 @@ php:
 services:
   - redis-server
 
-before_install: v=$(phpenv version-name); if [ ${v:0:1} -lt 7 ]; then pecl install redis; else echo "extension = redis.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi 
+before_install: v=$(phpenv version-name); if [ ${v:0:1} -lt 7 ]; then pecl install igbinary ; yes | pecl install redis; else echo "extension = redis.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi
 
 install:
-  - composer global require "fxp/composer-asset-plugin:^1.2.0"
-  - composer require codeclimate/php-test-reporter --dev
-  - composer install --no-progress --no-interaction
+  - composer global require --prefer-dist "fxp/composer-asset-plugin:^1.2.0"
+  - composer require codeclimate/php-test-reporter --dev --prefer-dist
+  - composer install --no-progress --no-interaction --prefer-dist
 
 script:
   - ./vendor/bin/phpunit --coverage-clover build/logs/clover.xml

Connection.php

@@ -77,13 +77,29 @@ public static function className()
      * Establishes a DB connection.
      * It does nothing if a DB connection has already been established.
      * @throws RedisException if connection fails
+     * @example 问题详细描述 https://bugs.php.net/bug.php?id=46851  php_redis.so 版本为4.0.2时会出现一条警告
+     * @see connect()
+     * @param string    $host
+     * @param int       $port
+     * @param float     $timeout
+     * @param int       $retry_interval
+     * @return bool
      */
-    public function open()
+    public function open( $host = null, $port = null, $timeout = null, $retry_interval = 0 )
     {
         if ($this->unixSocket !== null) {
             $isConnected = $this->connect($this->unixSocket);
         } else {
-            $isConnected = $this->connect($this->hostname, $this->port, $this->connectionTimeout);
+            if(is_null($host)){
+                $host = $this->hostname;
+            }
+            if(is_null($port)){
+                $port = $this->port;
+            }
+            if(is_null($timeout)){
+                $timeout = $this->connectionTimeout;
+            }
+            $isConnected = $this->connect($host, $port, $timeout, null, $retry_interval);
         }
 
         if ($isConnected === false) {

composer.json

@@ -22,5 +22,13 @@
   "require-dev": {
     "phpunit/phpunit": "<6.0",
     "yiisoft/yii2-redis": "^2.0"
+  },
+  "config": {
+    "fxp-asset": {
+      "vcs-driver-options": {
+      "github-no-api": true
+    },
+    "pattern-skip-version": "(-build|-patch)"
+    }
   }
 }