PHP：将目录文件数组转为带URL键的关联数组并输出JSON

云原生阿岚

2026-7-6

问题：修改PHP脚本生成带完整URL的JSON数组

我有一段PHP脚本，用于返回指定目录下的图片（或文件），当前最终输出为仅包含文件名的JSON数组。

现有代码：

<?php

$files = array();

$dir = opendir('/folderpath');
while ($file = readdir($dir)) {
    if ($file == '.' || $file == '..') {
        continue;
    }

    $files[] = $file;
}

header('Content-type: application/json');
echo json_encode($files);

当前输出的JSON：

["1.png","2.jpg","4.jpg","3.png"]

需求：为每个图片拼接完整URL，将每个元素转为以"url"为键、完整URL为值的关联数组，最终得到如下格式的JSON输出：

[
 {"url":"https://s3-us-west-2.amazonaws.com/appsdeveloperblog.com/images/cats/cat-1.png"},
 {"url":"https://s3-us-west-2.amazonaws.com/appsdeveloperblog.com/images/cats/cat-2.jpg"},
 {"url":"https://s3-us-west-2.amazonaws.com/appsdeveloperblog.com/images/cats/cat-3.jpg"},
 {"url":"https://s3-us-west-2.amazonaws.com/appsdeveloperblog.com/images/cats/cat-4.jpg"},
 {"url":"https://s3-us-west-2.amazonaws.com/appsdeveloperblog.com/images/cats/cat-5.jpg"},
 {"url":"https://s3-us-west-2.amazonaws.com/appsdeveloperblog.com/images/cats/cat-6.jpg"}
]

解决方案

修改后的代码如下：

<?php

$files = array();
// 定义URL前缀，根据实际场景调整
$baseUrl = 'https://s3-us-west-2.amazonaws.com/appsdeveloperblog.com/images/cats/';

$dir = opendir('/folderpath');
while ($file = readdir($dir)) {
    if ($file == '.' || $file == '..') {
        continue;
    }

    // 组装带url键的关联数组
    $files[] = [
        'url' => $baseUrl . $file
    ];
}

header('Content-type: application/json');
// JSON_PRETTY_PRINT可选，用于格式化输出提升可读性
echo json_encode($files, JSON_PRETTY_PRINT);