streams/Code/Text/Tagadelic.php

<?php

namespace Code\Text;

class Tagadelic
{

    public static function calc($arr)
    {

        $tags = [];
        $min = 1e9;
        $max = -1e9;

        $x = 0;
        if (! $arr) {
            return [];
        }

        foreach ($arr as $rr) {
            $tags[$x][0] = $rr['term'];
            $tags[$x][1] = log($rr['total']);
            $tags[$x][2] = 0;
            $min = min($min, $tags[$x][1]);
            $max = max($max, $tags[$x][1]);
            $x++;
        }

        usort($tags, 'self::tags_sort');

        $range = max(.01, $max - $min) * 1.0001;

        for ($x = 0; $x < count($tags); $x++) {
            $tags[$x][2] = 1 + floor(9 * ($tags[$x][1] - $min) / $range);
        }

        return $tags;
    }

    public static function tags_sort($a, $b)
    {
        if (strtolower($a[0]) === strtolower($b[0])) {
            return 0;
        }
        return((strtolower($a[0]) < strtolower($b[0])) ? -1 : 1);
    }
}