php/sort.php · 707 字节 · 下载原文

<?php
// sort.php —— 数组读写 + 嵌套循环 + 交换（冒泡排序）

function bubble_sort($arr) {
    $n = count($arr);
    for ($i = 0; $i < $n - 1; $i++) {
        for ($j = 0; $j < $n - 1 - $i; $j++) {
            if ($arr[$j] > $arr[$j + 1]) {
                $t = $arr[$j];
                $arr[$j] = $arr[$j + 1];
                $arr[$j + 1] = $t;
            }
        }
    }
    return $arr;
}

$data = [5, 3, 9, 1, 7, 2];
$sorted = bubble_sort($data);

echo "排序后：";
foreach ($sorted as $v) {
    echo $v, " ";
}
echo "
";

// 就地排序 + 追加
$a = [];
foreach ([4, 2, 8] as $v) {
    $a[] = $v;
}
echo "count=", count($a), "
";
echo "implode=", implode("-", $a), "
";
?>