If you receive an error such as PHP Fatal error: Allowed Memory size of 8388408 bytes exhaused (tried to to allocate ... bytes)... in then this means your memory limit is set too low for the script to function properly. A lot of people with default PHP installations have 8 megabytes for their memory limit while we recommend at least 64 megabytes for a memory limit.
This error can typically occur when PHP tries to process a large database or when importing or exporting.
In order to resolve this issue you should change memory allocation limit for all PHP scripts by modifying the php.ini configuration file. Find memory_limit after opening the file in an editor and if this line does not exist add it so that it looks like this:
memory_limit = 64 M
Increase the memory limit until the PHP script is running perfectly or until the limit of your system hardware.
Memory exhausted errors can cause people to have blank pages by not allowing pages to finish loading, apparently stopping them in the middle.
