在上一篇《在Laravel外使用Eloquent（一）》 中我们演示了如何引入Eloquent以及基本使用，但是如果细心的朋友肯定会发现，当你在使用paginate(15)来分页的时候是会报错的。因为我们没有依赖laravel的pagination模块。但是引入那个模块同时它内部依赖了symfony的http-foundation模块，意味着为了一个分页功能我们要装好多东西。于是我就实现了一个比较简单的分页类：
代码见：https://github.com/overtrue/rester
php<?php namespace Rester; /** * Paginator.php * * (c) 2014 overtrue <anzhengchao@gmail.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. * * @author overtrue <anzhengchao@gmail.com> * @github https://github.com/overtrue * @url http://overtrue.me * @date 2014-10-23T20:05:33 */ use Closure; use Countable; use ArrayAccess; use Serializable; use ArrayIterator; use JsonSerializable; use IteratorAggregate; class Paginator implements ArrayAccess, Countable, IteratorAggregate, Serializable, JsonSerializable { protected $pager; protected $pageSize; protected $total; protected $items; /** * Constructor * * @param string $pager */ public function __construct($pager = 'page') { $this->pager = $pager; } /** * Make a pagination * * @param array $items * @param integer $total * @param integer $pageSize * * @return array */ public function make($items, $total, $pageSize = 10) { $this->total = abs($total); $this->pageSize = $pageSize; $this->items = $items; return $this; } /** * Return current page * * @return integer */ public function getCurrentPage($total = null) { $page = abs(app()->request->get('page', 1)); if ($total) { $this->total = $total; } $page >= 1 || $page = 1; if ($this->items) { $totalPage = $this->getTotalPage(); $page <= $totalPage || $page = $totalPage; } return $page; } /** * Return total pages * * @return integer */ public function getTotalPage() { $this->pageSize > 0 || $this->pageSize = 10; $totalPage = ceil($this->total / $this->pageSize); $totalPage >= 1 || $totalPage = 1; return $totalPage; } public function links() { $html = '<ul class="pagination">'; $totalPage = $this->getTotalPage(); $currentPage = $this->getCurrentPage(); if ($totalPage < 10) { for ($i = 1; $i <= $totalPage; $i++) { $active = $i == $currentPage ? 'class="active"':''; $html .= "<li $active><a href=".$this->getLink($i).">$i</a></li>"; } } else { if ($currentPage > 3) { $html .= "<li><a href=".$this->getLink(1).">«</a></li>"; $start = $currentPage - 2; } else { $start = 1; } for ($i = $start; $i <= $currentPage; $i++) { $active = $i == $currentPage ? 'class="active"':''; $html .= "<li $active><a href=".$this->getLink($i).">$i</a></li>"; } for ($i = $currentPage + 1; $i <= $currentPage + 3; $i++) { $active = $i == $currentPage ? 'class="active"':''; $html .= "<li $active><a href=".$this->getLink($i).">$i</a></li>"; } if ($totalPage - $currentPage >= 5) { $html .= "<li><a href='javascript:void(0)'>...</a></li>"; $html .= "<li><a href=".$this->getLink($totalPage).">$totalPage</a></li>"; } } return $html .= '</ul>'; } /** * getLink * * @param integer $page * * @return string */ public function getLink($page) { static $query; if (is_null($query)) { $query = app()->request->get(); } $query['page'] = $page; return "?" . http_build_query($query); } /** {@inhertDoc} */ public function jsonSerialize() { return $this->items; } /** {@inhertDoc} */ public function serialize() { return serialize($this->items); } /** {@inhertDoc} */ public function unserialize($data) { return $this->items = unserialize($data); } /** {@inhertDoc} **/ public function getIterator() { return new ArrayIterator($this->items); } /** {@inhertDoc} */ public function count($mode = COUNT_NORMAL) { return count($this->items, $mode); } /** * Get a data by key * * @param string $key * * @return mixed */ public function __get($key) { return $this[$key]; } /** * Assigns a value to the specified data * * @param string $key * @param mixed $value * * @return void */ public function __set($key, $value) { $this->items[$key] = $value; } /** * Whether or not an data exists by key * * @param string $key * * @return bool */ public function __isset($key) { return isset($this->items[$key]); } /** * Unsets an data by key * * @param string $key */ public function __unset($key) { unset($this->items[$key]); } /** * Assigns a value to the specified offset * * @param string $offset * @param mixed $value * * @return void */ public function offsetSet($offset, $value) { $this->items[$offset] = $value; } /** * Whether or not an offset exists * * @param string $offset * * @access public * * @return bool */ public function offsetExists($offset) { return isset($this->items[$offset]); } /** * Unsets an offset * * @param string $offset * * @return array */ public function offsetUnset($offset) { if ($this->offsetExists($offset)) { unset($this->items[$offset]); } } /** * Returns the value at specified offset * * @param string $offset * * @return mixed */ public function offsetGet($offset) { return $this->offsetExists($offset) ? array_get($this->items, $offset) : null; } } ``` 然后在我们初始化eloquent的方装载这个分页类到eloquent中就好： ```php //... use Rester\Paginator; // 注册分页类 Capsule::setPaginator(function() use ($app, $config) { return new Paginator($app->request, $config->get('pager', 'page')); }); //... ``` 完整的eloquent初始化步骤请参考： https://github.com/overtrue/rester/blob/master/start/eloquent.php 然后我们就可以正常使用分页功能了： ```php $users = User::paginate(15); $users = User::where('status', 1)->paginate(15); ... ``` 因为上面的分页类实现了常用的[预定义接口](http://php.net/manual/zh/reserved.interfaces.php), 所以你可以很方便的使用分页结果： ```php // 遍历 foreach ($users as $user) { // do sth. } // json encode $json = json_encode($users); // count $count = count($users); //... ``` 另外还考虑到了大家不一定全用它写接口用，所以分页类同样实现了Laravel里的生成分页链接的方法：`$users->links()`, 它会生成bootstrap格式的分页列表： ```html <ul class="pagination"> <li><a href="#">«</a></li> <li><a href="#">1</a></li> <li><a href="#">2</a></li> <li><a href="#">3</a></li> <li><a href="#">4</a></li> <li><a href="#">5</a></li> <li><a href="#">»</a></li> </ul> ``` demo: ```php <div class="container"> <?php foreach ($users as $user): ?> <?php echo $user->name; ?> <?php endforeach; ?> </div> <?php echo $users->links(); ?>
OK,那么现在你就可以很方便的在你的项目里无忧的使用Eloquent啦。
原文： http://overtrue.me/2014/11/25/using-eloquent-outsite-laravel-2.html
