Fatal error: Allowed memory size of 123456 bytes exhausted (tried to allocate 234567 bytes) in /path/file.php

Php is setup is to limit memory usage per process. If you require more, this limit can be increased.
Edit
/usr/local/lib/php.ini
and set:
memory_limit = 8M
;

Maximum amount of memory a script may consume (8MB)
to a higher value, like 20M. Save, exit, then restart apache.

-- Swapnil M