我正在尝试使用Composer在运行PHP 5.6.40的Docker容器中安装依赖项。
它运行，但退出，供应商目录始终为空。
MacBook:my-app dev$ docker exec my-app_php56_1 php -d memory_limit=-1 composer.phar update -vvv --no-cache --no-plugins
Disabling cache usage
Running 1.9.0 (2019-08-02 20:55:32) with PHP 5.6.40 on Linux / 4.9.184-linuxkit
Do not run Composer as root/super user! See https://getcomposer.org/root for details
Reading ./composer.json
Loading config file ./composer.json
Checked CA file /etc/ssl/certs/ca-certificates.crt: valid
Executing command (/var/www/html): git branch --no-color --no-abbrev -v
Reading /root/.composer/composer.json
Loading config file /root/.composer/composer.json
Loading composer repositories with package information
Downloading https://repo.packagist.org/packages.json
Updating dependencies (including require-dev)
Downloading http://repo.packagist.org/p/provider-2013%24b962a943715f142bd3c36c0e87b67b28b16c014a98898622ec735220b7e1ee4f.json
Downloading http://repo.packagist.org/p/provider-2014%24ecc1513d9762efcfd48fdbaf4a08f829a59093064f40b7c351f93f3fbdd07973.json
Downloading http://repo.packagist.org/p/provider-2015%24258303eff7165b17439353fe44e501a3a6d600bd5b5482c5261a2ffa2234a947.json
Downloading http://repo.packagist.org/p/provider-2016%2496e2313b5ba90c2b798b03f9e306a27c15f11f763cd6478b834943fc128fc111.json
Downloading http://repo.packagist.org/p/provider-2017%24d2ad294ebaf381b7bf68cacbe514cf2bb33c3a919b97319bfa2e2ffaa66bc511.json
Downloading http://repo.packagist.org/p/provider-2018%2466893d07acdb18bb12d5e92e062b6e3058f5d284292b09cf585bf0ceb1b26aca.json
Downloading http://repo.packagist.org/p/provider-2018-10%24ff53e18093ae3e52a84c5567489c78bf1d82d0af80f413c3d6ad35d541a28434.json
Downloading http://repo.packagist.org/p/provider-2019-01%2431194ef7551ee4bffd7cc09dd6d01dc60848afc129544438ac7931e9d42dd54e.json
...
Downloading http://repo.packagist.org/p/phpspec/phpspec%248dc959bd0ae544f84e5bceee933d9a61d0a2074b208c3b7e7807cdc320e83eee.json
Downloading http://repo.packagist.org/p/phpspec/php-diff%249b8687b7c99f069823a9ac8d17900f9c8243368ceea9a5ac4e71ab424bb6f2d5.json
Downloading http://repo.packagist.org/p/squizlabs/php_codesniffer%24386b3726c6c3ce5edde180a7881f924be5dfd720c951dc93db8455ae871e9d61.json
MacBook:my-app dev$
然后它只返回任何内容，供应商目录保持为空。
我正在运行没有任何插件或缓存的作曲家。
最后，完全相同的 composer.json 文件在我的另一个 PHP 7.1.x 容器中运行良好。
我还想知道最终依赖项是否导致了问题，因此尝试将其删除。还是没有运气。
编辑：
我现在回到了我的 PHP 7.1 容器并运行完全相同的脚本，它工作正常。作曲家的输出是(所以 5.6 版本只是在它执行"通过 SAT 解析依赖关系"时死亡：
...
Downloading http://repo.packagist.org/p/webmozart/assert%24f23cf2d90bee4a1a09dc1d005896d60e715bdb9ecd4531874bfc3dd3ea5908c1.json
Downloading http://repo.packagist.org/p/phpspec/phpspec%248dc959bd0ae544f84e5bceee933d9a61d0a2074b208c3b7e7807cdc320e83eee.json
Downloading http://repo.packagist.org/p/phpspec/php-diff%249b8687b7c99f069823a9ac8d17900f9c8243368ceea9a5ac4e71ab424bb6f2d5.json
Downloading http://repo.packagist.org/p/squizlabs/php_codesniffer%24386b3726c6c3ce5edde180a7881f924be5dfd720c951dc93db8455ae871e9d61.json
Resolving dependencies through SAT
Looking at all rules.
Something's changed, looking at all rules again (pass #16)
Dependency resolution completed in 28.879 seconds
Analyzed 21713 packages to resolve dependencies
Analyzed 1376894 rules to resolve dependencies
Resolving dependencies through SAT
Looking at all rules.
Dependency resolution completed in 0.003 seconds
Package operations: 116 installs, 0 updates, 0 removals
Installs: kylekatarnls/update-helper:1.2.0, stripe/stripe-php:v2.3.0, abraham/twitteroauth:0.6.6, ralouphie/getallheaders:3.0.3, psr/http-message:1.0.1, guzzlehttp/psr7:1.6.1, guzzlehttp/promises:v1.3.1, guzzlehttp/guzzle:6.0.2, maknz/slack:1.7.0, maknz/slack-laravel:1.0.0, sabberworm/php-css-parser:8.1.0, phenx/php-svg-lib:v0.3.2, phenx/php-font-lib:0.5.1, dompdf/dompdf:v0.8.3, vlucas/phpdotenv:v1.1.1
...
etc for everything else
从您运行的输出来看，您的作曲家设置似乎使用的是http而不是https。在安装编辑器之前运行以下命令：
composer config -g repo.packagist composer https://packagist.org
这个问题现在有点老了，所以我假设你已经解决了它。我最近遇到了同样的问题。
问题似乎源于PHP版本的更改。就我而言，我从 7.1 升级到 7.2，您可以想象这应该不会引起太多问题。
我的composer update -vvv --no-cache --no-plugins输出将显示
Resolving dependencies through SAT
Looking at all rules.
Something's changed, looking at all rules again (pass #[forever increasing])
尝试安装symfony/thanks后
最后，我不得不从composer.json上取下symfony/thanks，然后再次跑步。然后，它给我带来了一些其他软件包的问题，我也删除了这些软件包。一旦我成功运行，我就可以开始将有问题的软件包添加回我的composer.json，最终问题得到解决。
我认为潜在的问题是我的包的各个依赖项级别的许多冲突。
我想如果有人发现他们最终删除了越来越多的软件包，解决方案是从尽可能少的软件包开始(在我的情况下是默认的 Laravel composer.json(，并开始逐个添加新软件包。