让Laravel5支持memcache的方法

Laravel5框架在Cache和Session中不支持Memcache，看清了是Memcache而不是Memcached哦，MemCached是支持的但是这个扩展真的是装的蛋疼，只有修改部分源码让其来支持memcache了。具体修改部分如下：

找到sessioni管理器 Laravel\vendor/laravel/framework/src/Illuminate/Session/SessionManager.php，并增加如下代码：

/**
     * Create an instance of the Memcached session driver.
     *
     * @return IlluminateSessionStore
     */
    protected function createMemcacheDriver()
    {
        return $this->createCacheBased('memcache');
    }

接下来修改cache部分，找到Laravel/vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php
在该文件中增加以下代码：

/**
     * Create an instance of the Memcache cache driver.
     *
     * @return IlluminateCacheMemcachedStore
     */
    protected function createMemcacheDriver(array $config)
    {
        $prefix = $this->getPrefix($config);

        $memcache = $this->app['memcache.connector']->connect($config['servers']);

        return $this->repository(new MemcacheStore($memcache, $prefix));
    }

接下来找到文件： Laravel/vendor/laravel/framework/src/Illuminate/Cache/CacheServiceProvider.php 将memcache注册进去
修改如下：

/**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        $this->app->singleton('cache', function ($app) {
            return new CacheManager($app);
        });

        $this->app->singleton('cache.store', function ($app) {
            return $app['cache']->driver();
        });

        $this->app->singleton('memcached.connector', function () {
            return new MemcachedConnector;
        });

        $this->app->singleton('memcache.connector',function() {
　　　　　　　// 这里返回了MemcacheConnector,记得在Cache目录下创建这个class
            return new MemcacheConnector;
        });
        $this->registerCommands();
    }

/**
     * Get the services provided by the provider.
     *
     * @return array
     */
    public function provides()
    {
        return [
            'cache', 'cache.store', 'memcached.connector', 'command.cache.clear','memcache.connector'
        ];
    }

我们看到这个闭包函数中返回了MemcacheContector的对象，现在来创建此类。文件位置：Laravel/vendor/laravel/framework/src/Illuminate/Cache/MemcacheConnector.php

<?php
namespace Illuminate\Cache;

use Memcache;
use RuntimeException;

class MemcacheConnector {

    /**
     * Create a new Memcached connection.
     *
     * @param array  $servers
     * @return Memcache
     */
    public function connect(array $servers)
    {
        $memcache = $this->getMemcache();

        // For each server in the array, we'll just extract the configuration and add
        // the server to the Memcache connection. Once we have added all of these
        // servers we'll verify the connection is successful and return it back.
        foreach ($servers as $server)
        {
            $memcache->addServer($server['host'], $server['port'], $server['weight']);
        }

        if ($memcache->getVersion() === false)
        {
            throw new RuntimeException("Could not establish Memcache connection.");
        }

        return $memcache;
    }

    /**
     * Get a new Memcache instance.
     *
     * @return Memcached
     */
    protected function getMemcache()
    {
        return new Memcache;
    }
}

按照第二步的流程这个文件会执行connect的方法，执行完成之后返回一个Memcache的对象， 这时候第二步那里根据这边来创建了一个MemcacheStore的存储器。

文件地址：Laravel/vendor/laravel/framework/src/Illuminate/Cache/MemcacheStore.php

<?php

namespace Illuminate\Cache;

use Memcache;
use Illuminate\Contracts\Cache\Store;

class MemcacheStore extends TaggableStore implements Store
{
    /**
     * The Memcached instance.
     *
     * @var \Memcached
     */
    protected $memcached;

    /**
     * A string that should be prepended to keys.
     *
     * @var string
     */
    protected $prefix;

    public function __construct(Memcache $memcache, $prefix = '')
    {
        $this->memcache = $memcache;
        $this->prefix = strlen($prefix) > 0 ? $prefix.':' : '';
    }

    /**
     * Retrieve an item from the cache by key.
     *
     * @param  string|array  $key
     * @return mixed
     */
    public function get($key)
    {
        return $this->memcache->get($this->prefix.$key);
    }

    /**
     * Retrieve multiple items from the cache by key.
     *
     * Items not found in the cache will have a null value.
     *
     * @param  array  $keys
     * @return array
     */
    public function many(array $keys)
    {
        $prefixedKeys = array_map(function ($key) {
            return $this->prefix.$key;
        }, $keys);

        $values = $this->memcache->getMulti($prefixedKeys, null, Memcache::GET_PRESERVE_ORDER);

        if ($this->memcache->getResultCode() != 0) {
            return array_fill_keys($keys, null);
        }

        return array_combine($keys, $values);
    }

    /**
     * Store an item in the cache for a given number of minutes.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @param  int     $minutes
     * @return void
     */
    public function put($key, $value, $minutes)
    {
        $compress = is_bool($value) || is_int($value) || is_float($value) ? false : MEMCACHE_COMPRESSED;
        $this->memcache->set($this->prefix.$key, $value, $compress, $minutes * 60);
    }

    /**
     * Store multiple items in the cache for a given number of minutes.
     *
     * @param  array  $values
     * @param  int  $minutes
     * @return void
     */
    public function putMany(array $values, $minutes)
    {
        $prefixedValues = [];

        foreach ($values as $key => $value) {
            $prefixedValues[$this->prefix.$key] = $value;
        }

        $this->memcache->setMulti($prefixedValues, $minutes * 60);
    }
     /**
     * Store an item in the cache if the key doesn't exist.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @param  int     $minutes
     * @return bool
     */
    public function add($key, $value, $minutes)
    {
        return $this->memcache->add($this->prefix.$key, $value, $minutes * 60);
    }

    /**
     * Increment the value of an item in the cache.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @return int|bool
     */
    public function increment($key, $value = 1)
    {
        return $this->memcache->increment($this->prefix.$key, $value);
    }

    /**
     * Decrement the value of an item in the cache.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @return int|bool
     */
    public function decrement($key, $value = 1)
    {
        return $this->memcache->decrement($this->prefix.$key, $value);
    }

    /**
     * Store an item in the cache indefinitely.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @return void
     */
    public function forever($key, $value)
    {
        $this->put($key, $value, 0);
    }

    /**
     * Remove an item from the cache.
     *
     * @param  string  $key
     * @return bool
     */
    public function forget($key)
    {
        return $this->memcache->delete($this->prefix.$key);
    }

    /**
     * Remove all items from the cache.
     *
     * @return void
     */
    public function flush()
    {
        $this->memcache->flush();
    }

    /**
     * Get the underlying Memcached connection.
     *
     * @return \Memcached
     */
    public function getMemcached()
    {
        return $this->memcache;
    }

    /**
     * Get the cache key prefix.
     *
     * @return string
     */
    public function getPrefix()
    {
        return $this->prefix;
    }

    /**
     * Set the cache key prefix.
     *
     * @param  string  $prefix
     * @return void
     */
    public function setPrefix($prefix)
    {
        $this->prefix = ! empty($prefix) ? $prefix.':' : '';
    }
}

上述步骤操作完成后，接下来修改一下config.php中的驱动部分，增加如下代码段：

// 修改为memcached
'default' => env('CACHE_DRIVER', 'memcache'),

// stores 部分增加memcache配置
'memcache' => [
    'driver'  => 'memcache',
    'servers' => [
        [
            'host' => env('MEMCACHED_HOST', '127.0.0.1'),
            'port' => env('MEMCACHED_PORT', 11211),
            'weight' => 100,
        ],
    ],
],

至此完工，尽情享用吧。

后话，不知是不是c/c++搞多了的原因，刚开始用php做项目时其实我很不喜欢这些框架，原始惯了什么都喜欢自己来写，后来发现不对呀现在网络发展得太快了，什么都自己来造的话明显是力不从心了，后来接触了第一个框架CI，用它做了个项目还不错，再后来看到大家都在说这个Laravel，自己跟着也看看怎么样，说实话你不用它来做项目的话还真不知道它的便捷性，就这样用它做了个网站感觉挺不错呢，就这样边学习边用上了。大家没试过的话其实可以试一试，毕竟什么都尝试一下才知道什么适合自己。

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