Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate code example

Example 1: how to fix PHP Fatal error: Allowed memory size of 1610612736 bytes exhausted

php -d memory_limit=-1 composer.phar require hwi/oauth-bundle php-http/guzzle6-adapter php-http/httplug-bundle

Example 2: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 4096 bytes) laravel

1. Firstly i find which php.ini is working because i was using multiple xampp,
  so using : php --ini
2. after that in that file i updated the memory_limit = -1

Example 3: Fatal error: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 32 bytes) in

;memory_limit=512M