<?php
// execute command: php bubble-sorting.php 5 0 2
echo 'bubble sorting'.PHP_EOL;

$sort_array = array();
for ($i = 1; $i <= count($argv); $i++){
    $value = $argv[$i];
    if (preg_match('/^(--)/', $value)) {
        $value = substr($value, 2);
        $$value = true;
    }
    if (is_numeric($value))
        array_push($sort_array, $value);
}

bubble_sorting($sort_array, $detail);
var_dump($sort_array);

function bubble_sorting(&$sort_array){
    global $detail, $reverse;
    $loop_count = count($sort_array);
    for ($i = 0; $i < $loop_count; $i++){
        for ($j = 0; $j < $loop_count-1; $j++){
            if ($detail)
                print_r($sort_array);
            if (!$reverse && $sort_array[$j] > $sort_array[($j+1)])
                swap_positions($sort_array[$j], $sort_array[($j+1)]);
            else if ($reverse && $sort_array[$j] < $sort_array[($j+1)])
                swap_positions($sort_array[$j], $sort_array[($j+1)]);
        }
    }
}

function swap_positions(&$first_element, &$second_element){
    list($first_element, $second_element) = array($second_element, $first_element);
}