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我有一个包含 URL 的数组供下载：

$urls = array(
    'http://ads.320x60.us.dizplayzone.com/1.png',
    'http://ads.480x90.us.dizplayzone.com/1.png',
    'http://ads.768x120.us.dizplayzone.com/1.png',
    'http://ads.900x150.us.dizplayzone.com/1.png',
    'http://ads.320x60.us.dizplayzone.com/2.png',
    'http://ads.480x90.us.dizplayzone.com/2.png',
    'http://ads.768x120.us.dizplayzone.com/2.png',
    'http://ads.900x150.us.dizplayzone.com/2.png',
    'http://ads.320x60.us.dizplayzone.com/100.png',
    'http://ads.480x90.us.dizplayzone.com/100.png',
    'http://ads.768x120.us.dizplayzone.com/100.png',
    'http://ads.900x150.us.dizplayzone.com/100.png',
    'http://ads.320x60.us.dizplayzone.com/200.png',
    'http://ads.480x90.us.dizplayzone.com/200.png',
    'http://ads.768x120.us.dizplayzone.com/200.png',
    'http://ads.900x150.us.dizplayzone.com/200.png',
    'http://ads.320x60.us.dizplayzone.com/300.png',
    'http://ads.480x90.us.dizplayzone.com/300.png',
    'http://ads.768x120.us.dizplayzone.com/300.png',
    'http://ads.900x150.us.dizplayzone.com/300.png',
    'http://ads.320x60.us.dizplayzone.com/55.png',
    'http://ads.480x90.us.dizplayzone.com/55.png',
    'http://ads.768x120.us.dizplayzone.com/55.png',
    'http://ads.900x150.us.dizplayzone.com/55.png',
    'http://ads.320x60.us.dizplayzone.com/12.png',
    'http://ads.480x90.us.dizplayzone.com/12.png',
    'http://ads.768x120.us.dizplayzone.com/12.png',
    'http://ads.900x150.us.dizplayzone.com/12.png');

每个图像的宽度都在x.

现在的任务是找到最匹配给定任意屏幕分辨率的那些 URL。因此，例如，如果屏幕分辨率为 1920x1080，则数组将被缩短为仅包含 900 像素宽的 URL（即http://ads.900x150.us.dizplayzone.com/12.png，http://ads.900x150.us.dizplayzone.com/55.png等）

如果屏幕分辨率为 320x480，则数组将仅包含http://ads.320x60.us.dizplayzone.com/12.png等http://ads.320x60.us.dizplayzone.com/55.png）

我想模仿的是与使用 PHP 或 Java 的 HTML5 中图像标签的 srcset 属性基本相同的行为。

数组缩短后，仍然可以下载数组中的 URL。

这可以做到吗？

4

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