用PHP实现banner轮换的程序代码
程序
我们曾经访问过这样的网站,每次刷新banner都随机的变化,在这篇文章中,我们将给大家介绍用PHP来实现这个功能。
步骤
程序实现的原理是:调用一个数组,每个图象对应一个数组中的元素,然后我们设置随机数,只要随机得到一个数据就可以显示一副图象了。
第一个步是我们来产生一个随机数。每次刷新时我们都得到不同的随机数,具体代码为:
srand((float) microtime() * 10000000);
之后我们设置一个数组为image,然后再设置5个数组元素,代码如下:
$image[1]='/location/of/image1.jpg';
$image[2]='/location/of/image2.jpg';
$image[3]='/location/of/image3.jpg';
$image[4]='/location/of/image4.jpg';
$image[5]='/location/of/image5.jpg';
下面的代码实现的功能是从数组中随机选择一个元素:
$rn = array_rand($image);
然后我们来显示一个随机的图片:
echo '';
把上面的代码组合起来就可以了。
srand((float) microtime() * 10000000);
$image[1]='/location/of/image1.jpg';
$image[2]='/location/of/image2.jpg';
$image[3]='/location/of/image3.jpg';
$image[4]='/location/of/image4.jpg';
$image[5]='/location/of/image5.jpg';
$rn = array_rand($image);
echo '';
以上的代码是我们随机显示图片的代码,如果我们想使每个图片再加上各自的连接地址那么我们把上述的代码稍微改动下就可以了!把上述的数组改为二维数组:
$image[1]['pic']='/location/of/image1.jpg';
$image[1]['link']='/location/of/link1.php';
相应的显示代码为:
echo '';
echo '';
那么我们就可以完成我们标题的功能了,随机显示图片并且连接到不同的指定的地址:
srand((float) microtime() * 10000000);
$image[1]['pic']='/location/of/image1.jpg';
$image[1]['link']='/location/of/link1.php';
$image[2]['pic']='/location/of/image2.jpg';
$image[2]['link']='/location/of/link2.php';
$image[3]['pic']='/location/of/image3.jpg';
$image[3]['link']='/location/of/link3.php';
$image[4]['pic']='/location/of/image4.jpg';
$image[4]['link']='/location/of/link4.php';
$image[5]['pic']='/location/of/image5.jpg';
$image[5]['link']='/location/of/link5.php';
$rn = array_rand($image);
echo '';
echo '';
你可以把上面的代码拷到你的网页中去运行了。祝你好运

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