Description:
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The error_log isn't really helpful in many cases when analyzing it. We have a 
very large application with memory_limits enabled and see memory_limit problems 
in some cases. This might be intended (misuse of the software, driving it at its 
limits) or an indicator of a bug.

However i can't see wether it is case a) or b):

PHP Fatal error:  Allowed memory size of XXX bytes exhausted (tried to allocate 
XX bytes) in (some random file) on line XX

"some random file" might give me a hint what the user was doing but in many cases 
there are framework/infrastructure files involved in this is not at all helpful. 
What would be helpful would be a stack trace or the request variables involved in 
the call (which might get huge on the downside).

Expected result:
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PHPs error logs should be helpful in most cases.

Actual result:
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Hard fatal errors in the error_log are not helpful at all.