Fatal error: Allowed memory size of 167772160 bytes exhausted (tried to allocate 40 bytes) in code example

Example 1: Fatal error: Allowed memory size of 1610612736 bytes exhausted

Fatal error: Allowed memory size of 1610612736 bytes exhausted

export COMPOSER_MEMORY_LIMIT=-1
and restart composer update

Example 2: 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 3: PHP Fatal error: Allowed memory size of 134217728 bytes exhausted

memory_limit = 64M;