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Memory limit errors

If composer shows memory errors on some commands:

PHP Fatal error:  Allowed memory size of XXXXXX bytes exhausted <...>

The memory_limit ini value should be increased.

Note: Composer internally increases the memory_limit to 512M. It is a good idea to create an issue for composer if you get memory errors.

Get current value:

php -r "echo ini_get('memory_limit').PHP_EOL;"

Increase limit with php.ini for a CLI SAPI (ex. /etc/php5/cli/php.ini for Debian-like systems):

; Use -1 for unlimited or define explicit value like 512M
memory_limit = -1

Or with command line arguments:

php -d memory_limit=-1 composer.phar <...>