If you are receving the error message
[10-Feb-2013 10:48:07] PHP Warning: [eAccelerator] Can not create shared memory area in Unknown on line 0
[10-Feb-2013 10:48:07] PHP Fatal error: Unable to start eAccelerator module in Unknown on line 0
then you need to make the make changes in the php.ini file
search the extension in php.ini file.
If you found the “extnsion=” i.e. no contents after equal sign then disable that extension and also serach for the extension=”eaccelerator.so” and disable it.
Now, you should not receive such error again.