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本文介绍下，php实现云标签的一个简单例子，老外写的，很简炼。有需要的朋友，可以参考下人家的写法。
php 云标签的例子，代码如下：
<?php
/**
* @PHP 云标签
* @param $tags 标签列表
* @edit：bbs.it-home.org
*/
function printTagCloud($tags) {
// $tags is the array
arsort($tags);
$max_size = 32; // max font size in pixels
$min_size = 12; // min font size in pixels
// largest and smallest array values
$max_qty = max(array_values($tags));
$min_qty = min(array_values($tags));
// find the range of values
$spread = $max_qty - $min_qty;
if ($spread == 0) { // we don't want to divide by zero
$spread = 1;
}
// set the font-size increment
$step = ($max_size - $min_size) / ($spread);
// loop through the tag array
foreach ($tags as $key => $value) {
// calculate font-size
// find the $value in excess of $min_qty
// multiply by the font-size increment ($size)
// and add the $min_size set above
$size = round($min_size + (($value - $min_qty) * $step));
echo '' . $key . ' ';
}
}
//调用示例
$tags = array('weddings' => 32, 'birthdays' => 41, 'landscapes' => 62, 'ham' => 51, 'chicken' => 23, 'food' => 91, 'turkey' => 47,
'windows' => 82, 'apple' => 27);
printTagCloud($tags);
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