qwe.php

<?php
error_reporting(0);

class WorldCloud
{
    protected $stopword;
    protected $word;
    protected $n;

    public function __construct($word, $n)
    {
        $this->word = $word;
        $this->n = $n;
    }

    public function stopword()
    {
        $stopwordRaw = fopen("stopwordbahasa.csv", "r");

        $stopword = [];
        while (($line = fgets($stopwordRaw)) !== false) {
            $stopword[] = trim($line);
        }
        fclose($stopwordRaw);

        return $stopword;
    }

    public function process()
    {
        $stopword = $this->stopword();
        $words = explode(" ", $this->word);

        $results = array_values(array_diff($words, $stopword));

        $strings = [];
        $start = 0 - $this->n;
        $total = count($results);

        foreach ($results as $key => $string) {
            $output = [];

            for ($i = 0; $i < $this->n; $i++) {
                $output[] = $results[$start + $this->n];
                $start++;
            }

            $start--;
            $strings[] = implode(' ', $output);

        }

        array_pop($strings);
        $filtered = array_filter($strings, function ($element) {
            return is_string($element) && '' !== trim($element);
        });
        return $filtered;
    }
}

$sentences = [
    "bupati simeulue doyan makan pecel",
    "paman pergi ke rumah ahli biologi bersama jokowi",
    "kpu akan langsung klarifikasi ke parpol bila ada laporan soal dcs",
    "bendera merah putih fatmawati dari disobek ajudan bung karno hingga ditolak pak harto",
];
for ($i=1; $i <= 4; $i++) {
    print "\n n = {$i} \n";
    foreach ($sentences as $sentence) {
        print "Sentence: ".$sentence."\n";
        $wc = new WorldCloud($sentence, $i);
        print "Result: ".json_encode($wc->process())."\n\n";
    }
}