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$tags = array();$keywords = array();$keywords[] = "Hello World";$keywords[] = "Hello world Again";$keywords[] = "Hello Again";$keywords[] = "Hello Again one more time";$keywords[] = "Goodbye Seeya";$keywords[] = "Pencil";$keywords[] = "Howto sharpen pencil";$keywords[] = "Drawing paper";$keywords[] = "Drawing rocks";foreach($keywords as $keyword)	{	$words = explode(" ",$keyword);	foreach($words as $word)		{		$word = strtolower($word);		if (isset($tags[$word]))			{			$tags[$word] += 1;			}		else			{			$tags[$word] = 1;			}		}	}ksort($tags);foreach($tags as $tag=>$size)	{	$size += 7;	echo "<span style=\"font-size: {$size}px\">$tag</span> ";	}