如何在while循环中对项目进行分组?

时间:2013-12-05 08:32:20

标签: php mysql pdo

我正在尝试将我的输出从我的while循环中分组,在PHP中。

我想要实现的目标是,我想将每个“盒子”与相同的“exposure”组合在一起,然后每当有新的“exposure”新盒子出现时,应该出现换行符,并且应该对下一组曝光进行分组。

目前,我有这个PHP代码:

//Select from advertisements.   
global $dbh;
$r = $dbh->prepare("
SELECT * FROM advertisements 
WHERE exposure!='0' 
AND `status`='2' 
AND (clicks_left_micro>0 
OR clicks_left_mini>0 
OR clicks_left_standard>0 
OR clicks_left_extended>0 
OR fixed='1') 

ORDER BY exposure DESC, fixed DESC");
$r->execute();

$last = null;
while($row=$r->fetch(PDO::FETCH_ASSOC)){

    $exposure = $row['exposure'];
    switch ($exposure) {
        case 1:
            $type = "";
            break;
        case 2:
            $type = "ads-orange";
            break;
        case 3:
            $type = "ads-green";
            break;
        case 4:
            $type = "ads-blue";
            break;
    }

    if ($row['token'] != $last) {
        echo '

            <a href="#">
                <div class="col-xs-4 ads-box '.$type.'">
                    <div class="title">'.$row['title'].'</div>
                    <div class="content">'.$row['description'].'</div>
                </div>      
             </a>
        ';
        $last = $row['token'];
    }

}

上面的代码,只会将它们打印出来:

https://docs.google.com/file/d/0Bw9EQNU6ms6jUXVyY1pndVlpY2c/edit?usp=drivesdk

虽然,我想要的是这样的:

https://docs.google.com/file/d/0Bw9EQNU6ms6jU0JYaDlHWEZsN1k/edit?usp=drivesdk

我怎样才能做到这一点?

1 个答案:

答案 0 :(得分:3)

我会制作一个包含所有'曝光'的数组。

$dataArray = array();
foreach ($result as $value){
    $dataArray[$value['exposure']][] = $value;
}

这将产生一个数组($ dataArray),其中包含各自索引中的所有曝光类别。

现在你可以遍历每个'曝光':

foreach ($dataArray as $exposure => $value){

    echo 'Exposure: '.$exposure.'<br/>';
    foreach ($value as $item){
        // Any item information here.
    }
    echo '<hr>';
}