我正在尝试将依赖项安装到我在laraval中的现有项目之一。我已经将php.ini中的内存大小增加为2048M。但是，当我尝试使用“ composer install”时，仍然得到以下输出。谁能让我知道下一步该怎么做？我正在ubuntu 18，apache 2上运行，对于该项目，尤其是php 5.6。
PHP Fatal error: Allowed memory size of 2147483648 bytes exhausted (tried to allocate 32 bytes) in /usr/share/php/Composer/Package/Link.php on line 60
Fatal error: Allowed memory size of 2147483648 bytes exhausted (tried to allocate 32 bytes) in /usr/share/php/Composer/Package/Link.php on line 60
Check https://getcomposer.org/doc/articles/troubleshooting.md#memory-limit-errors for more info on how to handle out of memory errors.ef-user