# 氣泡排序法（Bubble Sort）

```php
function bubbleSort($nums) {
    if (count($nums) <= 1) {
        return $nums;
    }
    // 為每個值去比對所有值
    foreach($nums as $currentKey => $currentNum) {
        foreach($nums as $nextKey => $nextNum) {
            // 如果 `當前值` 比 `被比較的值` 大，則與該值交換位置，已達到遞增排序。如要遞減，則改成小於即可。
            if ($nums[$currentKey] < $nums[$nextKey]) {
                [$nums[$currentKey], $nums[$nextKey]] = [$nums[$nextKey], $nums[$currentKey]];
            }
        }
    }

    return $nums;
}

// 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
print_r(bubbleSort([3, 2, 1, 5, 4, 6, 7, 8, 9, 10]));
```


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