运行时我和其他人有同样的错误php ~/composer.phar update：
The following exception is caused by a lack of memory and not having swap configured
Check https://getcomposer.org/doc/articles/troubleshooting.md#proc-open-fork-failed-errors for details
Fatal error: Uncaught exception 'ErrorException' with message 'proc_open(): fork failed - Cannot allocate memory' in phar:///home/tea/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php:974
Stack trace:
0 [internal function]: Composer\Util\ErrorHandler::handle(2, 'proc_open(): fo...', 'phar:///home/te...', 974, Array)
1 phar:///home/tea/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php(974): proc_open('stty -a | grep ...', Array, NULL, NULL, NULL, Array)
2 phar:///home/tea/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php(784): Symfony\Component\Console\Application->getSttyColumns()
3 phar:///home/tea/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php(745): Symfony\Component\Console\Application->getTerminalDimensions()
4 phar:///home/tea/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php(675): Symfony\Component\Console\Application->getTerminalWidth()
5 phar:///home/tea/composer in phar:///home/tea/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php on line 974
...但是有一个 …