Posted By

johnloy on 06/18/08

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textmate

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Last Edited at 06/18/08 07:06pm

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PHP function to print a tag cloud

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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 '<a href="#" style="font-size: ' . $size . 'px" title="' . $value . ' things tagged with ' . $key . '">' . $key . '</a> ';
        }
}
 
$tags = array('weddings' => 32, 'birthdays' => 41, 'landscapes' => 62, 'ham' => 51, 'chicken' => 23, 'food' => 91, 'turkey' => 47, 'windows' => 82, 'apple' => 27);
 
printTagCloud($tags);