If you get an error like this:
Fatal error: Allowed memory size of x bytes exhausted (tried to allocate x bytes) in /path/to/php/script
or like this:
PHP Fatal error: Out of memory (allocated x) (tried to allocate x bytes) in /path/to/php/script
then you will need to increase the amount of memory that PHP is allowed to use.
In your php.ini file change the following setting to a memory limit that you can allow based on your servers limits:
memory_limit = 256M
If you are on hosted platform like cPanel you can edit this value in the mulit-PHP editor or contact the help desk for further information.