php 随机排序广告的实现代码_php技巧
投放广告的人都很关注他的广告会放在哪个位置, 因为这可能影响点击次数, 甚至是否在第一屏显示. 就这个问题, 其实很容易解决, 只要随机显示广告即可.
代码如何实现? 在这我推荐两种随机显示广告的处理办法.
在后端处理
在后端排序好再输出页面. 将广告节点用数组存放, 对数组进行随机排序, 再输出经过排序的数组. 参考代码 (PHP) 如下:
// 用数组存放广告列表
$ads = array('

,'

,'

,'

);
// 对数组进行随机排序
shuffle($ads);
// 输出经过排序的数组
$html = '';
foreach ($ads as $ad) {
$html .= $ad;
}
echo $html;
我们来扩展一下, 如果我是站长, 预留了 4 个广告位, 但现在只有 3 个在投放; 我想在空置的广告位放置一个 "虚位以待" 的广告招租链接, 并显示在最后, 该如何处理呢? 在排序完成之后再插放广告招租链接就可以了.
// 用数组存放广告列表
$ads = array('

,'

,'

);
// 对数组进行随机排序
shuffle($ads);
// 输出经过排序的数组
$html = '';
foreach ($ads as $ad) {
$html .= $ad;
}
// 添加广告招租链接
$html .= '

echo $html;
我就是用这个方法来输出 125x125 广告的, 因为它直观可靠, 处理方便. 但是如果你希望对页面做静态化, 建议选用 JS 随机排序的方法.
在前端处理
在后端按原有循序输出, 在页面通过 JavaScript 重新排序. 假设页面输出广告区域的 HTML 片段如下.
我们可以通过 JS 来对广告进行重新排序. 参考代码如下:
如果有如同方法 1 那样的扩展需求, 将空广告位显示在最后, 且显示广告招租链接, 该如何处理? 这个当作课后习题吧...

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