We need to Increase the limit by Editing php.ini files(xampp/php/php configuration file).
Open that file and search memory_limit.
Now we have to Write Memory_limit = -1 (This means use of unlimited size) and save it.
Now Try to create project by laravel new ProjectName.
Or, you can increase the limit with a command-line argument:
cmd: php -d memory_limit=-1 composer.phar require hwi/oauth-bundle php-http/guzzle6-adapter php-http/httplug-bundle