<?php
$vectors = [['quick'], ['brown', 'black', 'grey'], ['fox', 'dog']];


$output = [];

$tracker = [0, 0, 0];
$max = [2, 3, 1];

$i = 0;

while($i < 3) {
/*  while($tracker !== array_reverse($max)) { */
    $out = '';

    echo("<p>tracker: ");
    print_r($tracker);
    echo("</p>");

    foreach($tracker as $index => $tracked_count) {
        $out = $out . $vectors[$index][$tracked_count];
    }

    $reversed = array_reverse($tracker);

    echo("<p>reversed: ");
    print_r($reversed);
    echo("</p>");

    foreach($reversed as $index => $reverse_count) {
        if ($reverse_count == $max[$index]) {
            $reversed[$index] = 0;
        } else {
            $reversed[$index] = $reverse_count + 1;
            break;
        }
    }

    echo("<p>modified: ");
    print_r($reversed);
    echo("</p>");

    $tracker = array_reverse($reversed);

    echo("<p>new tracker: ");
    print_r($tracker);
    echo("</p>");

    echo("<h2>" . $out . "</h2>");

    $i++;
}


?>