PHP抓取豆瓣读书爬虫代码

<?php
//演示地址 http://asizu.sinaapp.com/reptile_douban.php
//数据量不是特别大，没有写抓完数据便停止。  喜欢的朋友拿去自己改改就好了
header("Content-Type:text/html;charset=utf-8");

define("MYSQL_HOST",SAE_MYSQL_HOST_M);
define("MYSQL_NAME","douban");
define("MYSQL_USER",SAE_MYSQL_USER);
define("MYSQL_PASSWORD",SAE_MYSQL_PASS);
define("MYSQL_PORT",SAE_MYSQL_PORT);

$action = $_GET['url'];

if(!empty($action))
{
    $data = getLink($action);
    $data = str_substr('<div class="article">','<div class="aside">',$data);
    $dataArray = explode('<dl>',$data);

    array_splice($dataArray,0,1);

    foreach($dataArray as $key => $item)
    {
        $bookArray[$key]['title']    = str_substr('class="title" target="_blank">','</a>',$item);
        $bookArray[$key]['rating']    = str_substr('<span class="rating_nums">','</span>',$item);
        $bookArray[$key]['book_id']    = str_substr('/subject/','/?from',$item);

        if(!selectBookSaveed($bookArray[$key]['title']))
        {
            insertMysql($bookArray[$key]);
        }

        //$dataArray[$key] = htmlspecialchars($item);
    }

    $page = explode('book?start=',$action);
    $new_url = $page[0] ."book?start=". ($page[1] + 15);
    // var_dump($page);

//    var_dump($bookArray);
}

//获取连接
function getLink($url)
{
    $data = getData($url);
    return $data;
}

//抓取数据的函数
function getData($url)
{
    //初始化
    $ch = curl_init();

    //设置选项，包括URL
    curl_setopt($ch,CURLOPT_URL,$url);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch,CURLOPT_HEADER,0);
    curl_setopt($ch,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11');

    //执行并获取HTML文档内容
    $output = curl_exec($ch);

    //释放curl句柄
    curl_close($ch);

    //返回数据
    return $output;
}

//保存入库
function insertMysql($dataArray)
{
    $field = "";
    $value = "";
    foreach($dataArray as $key => $item)
    {
        $field .= ",".$key;
        $value .= ",'".$item."'";
    }
    $field = substr($field,1,strlen($field)-1);
    $value = substr($value,1,strlen($value)-1);

    $sql = "INSERT INTO douban (".$field.") VALUES(".$value.")";
    // var_dump($sql);
    // exit;
    $result = mysqlOperation($sql);

    return $result;
}

//查询是否已经录入
function selectBookSaveed($title)
{
    $sql = "SELECT * FROM douban WHERE title = '".$title."'";
    $result = mysqlOperation($sql,"select");
    if(empty($result))
    {
        return false;//未存在
    }
    return true;
}

//数据库操作方法
function mysqlOperation($sql,$method = "query")
{
    $mysqli = new mysqli(
                            SAE_MYSQL_HOST_M,
                            SAE_MYSQL_USER,
                            SAE_MYSQL_PASS,
                            SAE_MYSQL_DB,
                            SAE_MYSQL_PORT
                        );
    if( mysqli_connect_errno() )
        echo 'error';
        // return false;

    if($method == "select")
        return mysqli_fetch_assoc($mysqli->query($sql));

    if($method == "query")
        return $mysqli->query($sql);

}

// 字符串截取函数
function str_substr($start, $end, $str)
{
    $temp = explode($start, $str, 2);
    $content = explode($end, $temp[1], 2);
    return $content[0];
}
?>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.4.min.js"></script>
<script>
$(document).ready(function(){
    if($("#input").val() != ""){
        $("#froms").submit();
    }
});
</script>
<form action="?" method="get" id="froms">
<input id="input" value="<?php echo $new_url; ?>" type="text" name="url">
<input type="submit">
</form>