Here is another way to solve this problem under windows, if you use Wampserver. Indeed at the level of wampserver, there are two php.ini files, that of PHP, which one can find in the location C: \ wamp64 \ bin \ php \ phpx.xx \ php.ini and that of Apache , which can be found at location C: \ wamp64 \ bin \ apache \ apachex.xx \ bin \ php.ini. Both of these files have the memory_limit parameter. So to be sure to solve this problem, it is better to set the memory_limit = -1 parameter in both files at once.

Mac php 7.4

run

php --ini

Configuration File (php.ini) Path: /usr/local/etc/php/7.4
Loaded Configuration File:         /usr/local/etc/php/7.4/php.ini
Scan for additional .ini files in: /usr/local/etc/php/7.4/conf.d
Additional .ini files parsed:      /usr/local/etc/php/7.4/conf.d/ext-opcache.ini,
/usr/local/etc/php/7.4/conf.d/php-memory-limits.ini

如果解析了额外的.ini文件: Memory_limit需要在

/usr/local/etc/php/7.4/conf.d/php-memory-limits.ini

正如Jose Seie所写，设置内存为

memory_limit = -1 or memory_limit = 1G

Fatal error: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 4096 bytes) in phar:///usr/local/bin/composer/src/Composer/DependencyResolver/RuleWatchGraph.php on line 52 Check https://getcomposer.org/doc/articles/troubleshooting.md#memory-limit-errors for more info on how to handle out of memory errors.

Set memory_limit to -1 works for me;) (vim /etc/php/7.2/cli/php.ini)

实际上，如果你设置内存限制为-1(无限)，它应该工作。 例如:

php -d memory_limit=-1 /usr/local/bin/composer update
/usr/bin/php7.1 -d memory_limit=-1 /usr/local/bin/composer update

在你的PHP目录中找到PHP .ini，如果xampp在xampp/PHP中 和内部php.ini文件更新内存限制:512M到2048M

运行composer dump-autoload为我解决了这个问题。