教你在PHP ZipArchive解压缩时，去掉zip包里的多余目录层级

<?php

set_time_limit(0);
$config = (object)[
    'zips'    => __DIR__ . '/zips',
    'uniapp'  => __DIR__ . '/uniapp',
];

downloadAndExtract('https://dl.discuz.chat/uniapp_latest.zip', 'uniapp');

function downloadAndExtract($zipUrl, $key)
{
    global $config;

    echo "正在下载: $zipUrl\n";
    $zipData = file_get_contents($zipUrl);
    $zipFile = $config->zips . "/$key-" . date('Ymd-His') . '.zip';
    file_put_contents($zipFile, $zipData);

    echo "正在解压到 {$config->$key} \n";
    $zip = new ZipArchive;

    if ($key === 'uniapp') {
        if ($zip->open($zipFile) === true) {
            $folder = $zip->getNameIndex(0);
            for ($i = 1; $i < $zip->numFiles; $i++) {
                $filename = $zip->getNameIndex($i);
                if (substr($filename, -1, 1) === '/') {
                    continue;
                }

                // $folder like => uniapp_v2.1.201029/
                // $filename like => uniapp_v2.1.201029/commitlint.config.js
                $newFileName = $config->$key . '/' . str_replace($folder, '', $filename);
                if (!file_exists(dirname($newFileName))) {
                    mkdir(dirname($newFileName), 0644, true);
                }
                copy("zip://{$zipFile}#{$filename}", $newFileName);
            }
            $zip->close();
        }
    } 

    echo "-------------- SUCESS --------------\n";
}