PHP抓取天气预报

最近遇到个项目，客户非要加个天气预报功能，还提出要求最少显示三天。到网上找了很多挂件都无法找到满足要求的，这可让老夫如何是好~~~于是乎被逼无耐下，自己写了这个抓取类。

主要功能只是将所须省市的七天的天气抓取下来，目前我这个项目中应用了缓存，但因为是FLEA的缓存机制，所以把代码贴出来对不使用FLEA的同学完全没有帮助，所以就省了点代码。

关于缓存方面，我个人比较倾向于按你读取的天数来确定缓存时间，比如：你一次只显示今天和明天的，那抓取来的七天数据就可以使用六次，直到七天数据用完的时候才需要重新抓取。

如图：

这样处理缓存我个人觉得比较划算，呵呵。

[PS]: 贴代码是个辛苦活，记得以前有些几个网站是可以分享代码片段的，但忘了名字，有同学愿意告诉一下我吗？

先上源码：

<?php
class Model_Weather
{
    private $_server = 'http://qq.ip138.com';
    private $_ext = '.htm';
    private $_province;
    private $_city;

    function __construct($province='guangdong', $city='zhongshan')
    {
        $this->_province = $province;
        $this->_city = $city;
    }

    function setServer($server)
    {
        $this->_server = $server;
    }

    function setProvince($province)
    {
        $this->_province = $province;
    }

    function setCity($city)
    {
        $this->_city = $city;
    }

    function setExt($ext)
    {
        $this->_ext = $ext;
    }

    function getPageLink()
    {
        return $this->_server . '/weather/' .
               $this->_province . '/' .
               $this->_city .
               $this->_ext;
    }

    function getIconLink($icon)
    {
        return $this->_server . $icon;
    }

    // 最好是使用缓存，不然比较废时。
    function fetch($display = 3)
    {
        $weather = $this->_fetch();

        for ($i=0; $i<$display; $i++)
        {
            $return[] = $weather[$i];
        }

        return $return;
    }

    function _fetch()
    {
        $content = $this->fopen_url($this->getPageLink());
        $match = $this->find("<table width="700" borderColorDark="#ffffff" borderColorLight="#008000" border="1" cellspacing="0" cellpadding="1" align="center"", "table>", $content);

        $table = $this->findAll("<tr", "tr>", $match);

        $dates = $this->getDate($table[0]);
        $icons = $this->getIcons($table[1]);
        $temperatures = $this->getTemperature($table[2]);

        foreach ($dates as $i => $date)
        {
            $return[$i] = array(
                'date' => explode(' ', $date),
                'icons' => $icons[$i],
                'temperature' => $temperatures[$i],
            );
        }

        return $return;
    }

    // 日期
    function getDate($table)
    {
        $dates = $this->findAll("<th class="tdc1" style="white-space:nowrap;"", "td>", $table);
        return array_map('strip_tags', $dates);
    }

    // 天气图标及文字
    function getIcons($table)
    {
        $tds = $this->findAll("<td", "td>", $table);

        array_shift($tds);
        foreach ($tds as $i => $td)
        {
            $t = explode('<br/>', $td);
            $r1 = "/src="(.*?)"/is";
            preg_match_all($r1, $t[0], $icons);
            $icon = array_map(array($this, 'getIconLink'), $icons[1]);
            $rows[$i] = array(
                'text' => strip_tags($t[1]),
                'images' => $icon
            );
        }

        return $rows;
    }

    // 气温
    function getTemperature($table)
    {
        $dates = $this->findAll("<td", "td>", $table);
        array_shift($dates);
        return array_map('strip_tags', $dates);
    }

    function find($begin, $end, $content)
    {
        $match = '';
        $r = "/{$begin}(.*?){$end}/is";
        preg_match($r, $content, $match);

        return $match[0];
    }

    function findAll($begin, $end, $content)
    {
        $matchs = '';
        $r = "/{$begin}(.*?){$end}/is";
        preg_match_all($r, $content, $matchs);

        return $matchs[0];
    }

    function fopen_url($url)
    {
        if (function_exists('file_get_contents')) {
            $file_content = @file_get_contents($url);
        } elseif (ini_get('allow_url_fopen') && ($file = @fopen($url, 'rb'))) {
            $i = 0;
            while (!feof($file) && $i++ < 1000) {
                $file_content .= strtolower(fread($file, 4096));
            }
            fclose($file);
        } elseif (function_exists('curl_init')) {
            $curl_handle = curl_init();
            curl_setopt($curl_handle, CURLOPT_URL, $url);
            curl_setopt($curl_handle, CURLOPT_CONNECTTIMEOUT,2);
            curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER,1);
            curl_setopt($curl_handle, CURLOPT_FAILONERROR,1);
            curl_setopt($curl_handle, CURLOPT_USERAGENT, 'Trackback Spam Check'); //引用垃圾邮件检查
            $file_content = curl_exec($curl_handle);
            curl_close($curl_handle);
        } else {
            $file_content = '';
        }
        return iconv("gb2312", "utf-8",$file_content);
    }

}
?>

返回数据结构：

Array
(
    [0] => Array
        (
            [date] => Array
                (
                    [0] => 2011-5-6
                    [1] => 星期五
                )
            [icons] => Array
                (
                    [text] => 阴
                    [images] => Array
                        (
                            [0] => http://qq.ip138.com/image/b2.gif
                        )
                )
            [temperature] => 27℃～22℃
        )
    [1] => Array
        (
            [date] => Array
                (
                    [0] => 2011-5-7
                    [1] => 星期六
                )
            [icons] => Array
                (
                    [text] => 多云
                    [images] => Array
                        (
                            [0] => http://qq.ip138.com/image/b1.gif
                        )
                )
            [temperature] => 29℃～22℃
        )
    [2] => Array
        (
            [date] => Array
                (
                    [0] => 2011-5-8
                    [1] => 星期日
                )
            [icons] => Array
                (
                    [text] => 多云
                    [images] => Array
                        (
                            [0] => http://qq.ip138.com/image/b1.gif
                        )
                )
            [temperature] => 30℃～23℃
        )
    [3] => Array
        (
            [date] => Array
                (
                    [0] => 2011-5-9
                    [1] => 星期一
                )
            [icons] => Array
                (
                    [text] => 阵雨
                    [images] => Array
                        (
                            [0] => http://qq.ip138.com/image/b3.gif
                        )
                )
            [temperature] => 29℃～21℃
        )
    [4] => Array
        (
            [date] => Array
                (
                    [0] => 2011-5-10
                    [1] => 星期二
                )
            [icons] => Array
                (
                    [text] => 阵雨转多云
                    [images] => Array
                        (
                            [0] => http://qq.ip138.com/image/b3.gif
                            [1] => http://qq.ip138.com/image/b1.gif
                        )
                )
            [temperature] => 27℃～21℃
        )
    [5] => Array
        (
            [date] => Array
                (
                    [0] => 2011-5-11
                    [1] => 星期三
                )
            [icons] => Array
                (
                    [text] => 多云
                    [images] => Array
                        (
                            [0] => http://qq.ip138.com/image/b1.gif
                        )
                )
            [temperature] => 28℃～21℃
        )
    [6] => Array
        (
            [date] => Array
                (
                    [0] => 2011-5-12
                    [1] => 星期四
                )
            [icons] => Array
                (
                    [text] => 多云
                    [images] => Array
                        (
                            [0] => http://qq.ip138.com/image/b1.gif
                        )
                )
            [temperature] => 28℃
        )
)