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如何理解composer的错误，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
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composer遇到的错误汇集
1#权限错误
file_put_contents(/home/vagrant/.composer/cache/repo/https---packagist.laravel-china.org/packages.json): failed to open stream: Permission denied https://packagist.laravel-china.org could not be fully loaded, package information was loaded from the local cache and may be out of date
解决方法：sudo chown -R $USER ~/.composer/
2# zlib_decode():data error
Failed to decode response: zlib_decode(): data error Retrying with degraded mode, check https://getcomposer.org/doc/articles/troubleshooting.md#degraded-mode for more info
解决方法 更换composer的repo.packagist
3# SSL routines:ssl3_get_server_certificate:certificate verify failed
错误描述
- Installing phpunit/phpunit (6.5.8): Downloading (failed) Downloading (failed) Downloading (failed) Failed to download phpunit/phpunit from dist: The "https://files.phpcomposer.com/files/sebastianbergmann/phpunit/4f21a3c6b97c42952fd5c2837bb354ec0199b97b.zip" file could not be downloaded: SSL operation failed with code 1. OpenSSL Error messages: error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed Failed to enable crypto failed to open stream: operation failed Now trying to download from source
解决方案
In my case, it was the CA Cert file that was the culprit Open terminal and run php -r "var_dump(openssl_get_cert_locations());" Note the location of default_cert_file. It might say \usr\local\ssl\cert.pem Verify that that file exists. If not, download the cacert.pem file from https://curl.haxx.se/ca/cacert.pem and place it in somewhere preferably in /usr/local/ssl You now have a file is usr/local/ssl/cacert.pem Open your php.ini and add the location of the file openssl.cafile=cacert.pem Run composer config --global cafile "/usr/local/ssl/cacert.pem" If it's of any use to others, I use valet+ 1.0.26, composer 1.8.4 OSX Movajes 10.14.3, php7.3 and simply specifying the cert composer looks for with: composer config --global cafile "/usr/local/etc/openssl/cert.pem"
composer config --global cafile "C:/AMP_ENV/php-7.1.15/ca/cacert.pem" composer config --global --list
4# proc_open(): fork failed - Cannot allocate memory
错误描述
Installation failed, reverting ./composer.json to its original content. The following exception is caused by a lack of memory or swap, or not having swap configured Check https://getcomposer.org/doc/articles/troubleshooting.md#proc-open-fork-failed-errors for details PHP Warning: proc_open(): fork failed - Cannot allocate memory in phar:///usr/local/bin/composer/vendor/symfony/console/Application.php on line 952 Warning: proc_open(): fork failed - Cannot allocate memory in phar:///usr/local/bin/composer/vendor/symfony/console/Application.php on line 952 [ErrorException] proc_open(): fork failed - Cannot allocate memory
解决方式
sudo dd if=/dev/zero of=/var/swap.1 bs=1M count=1024 sudo mkswap /var/swap.1 sudo swapon /var/swap.1
5# 执行 composer 抛出 Killed
错误描述
root@test2:/work/usrc$ composer require qcloud/cos-sdk-v5 ./composer.json has been updated The "extra.asset-installer-paths" option is deprecated, use the "config.fxp-asset.installer-paths" option Loading composer repositories with package information Updating dependencies (including require-dev) Killed
解决方式
出现此原因大多因为缓存不足造成，在linux环境可增加缓存解决。
free -m sudo mkdir -p /var/_swap_ cd /var/_swap_ sudo dd if=/dev/zero of=swapfile bs=1M count=2000 sudo mkswap swapfile sudo swapon swapfile sudo echo "/var/_swap_/swapfile none swap sw 0 0" >> /etc/fstab free -m
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