php创建tag云

这段php代码用来创建tag云输出，不同的tag标签会设置不同的字体大小

function getCloud( $data = array(), $minFontSize = 12, $maxFontSize = 30 )
{
	$minimumCount = min( array_values( $data ) );
	$maximumCount = max( array_values( $data ) );
	$spread       = $maximumCount - $minimumCount;
	$cloudHTML    = '';
	$cloudTags    = array();
 
	$spread == 0 && $spread = 1;
 
	foreach( $data as $tag => $count )
	{
		$size = $minFontSize + ( $count - $minimumCount )
			* ( $maxFontSize - $minFontSize ) / $spread;
		$cloudTags[] = '<a style="font-size: ' . floor( $size ) . 'px'
		. '" class="tag_cloud" href="#" title="\'' . $tag  .
		'\' returned a count of ' . $count . '">'
		. htmlspecialchars( stripslashes( $tag ) ) . '</a>';
	}
 
	return join( "\n", $cloudTags ) . "\n";
}
/**************************
****   Sample usage    ***/
$arr = Array('Actionscript' => 35, 'Adobe' => 22, 'Array' => 44, 'Background' => 43,
	'Blur' => 18, 'Canvas' => 33, 'Class' => 15, 'Color Palette' => 11, 'Crop' => 42,
	'Delimiter' => 13, 'Depth' => 34, 'Design' => 8, 'Encode' => 12, 'Encryption' => 30,
	'Extract' => 28, 'Filters' => 42);
echo getCloud($arr, 12, 36);