每天laravel-20160707|KeyWritten

<?php

namespace Illuminate\Cache\Events;
// name space
class KeyWritten
{
/**
* The key that was written.
*
* @var string
*/
public $key;// a key

/**
* The value that was written.
*
* @var mixed
*/
public $value;// a value

/**
* The number of minutes the key should be valid.
*
* @var int
*/
public $minutes;// a save times ,  life cycle,

/**
* The tags that were assigned to the key.
*
* @var array
*/
public $tags;// a tags

/**
* Create a new event instance.
*
* @param  string  $key
* @param  mixed  $value
* @param  int  $minutes
* @param  array  $tags
* @return void
*/
public function __construct($key, $value, $minutes, $tags = [])
{
$this->key = $key;//key
$this->tags = $tags;// tags
$this->value = $value;// value
$this->minutes = $minutes;//minutes
}// a new instance about the construct, a
// why use minutes,because we need to tell the  function the life cycle.
}