PHP Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 2107838 bytes) in phar:///app/.heroku/php/bin/composer/src/Composer/Util/RemoteFilesystem.php 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: PHP Fatal error: Allowed memory size of 134217728 bytes exhausted

memory_limit = 64M;