PHP to stop Apache from logging specific 404s

[Thu May  7 13:23:47 2009] [error] [client xx.xx.xxx.x] File does not exist: /home/osbornew/live/7150.cfm

The trick is, I've got a custom 404 error handling page.  It queries a database with the info /7150.cfm and serves up a valid page.  If /7150.cfm is not in the database, it shows the 404 error page and gives the 404 header.

The trouble is all of these "File does not exist" messages are filling up my Apache error log.  Can I disable them with PHP if it finds something in the DB?  And/or, can we disable logging 404 messages altogether for Apache?

Thanks!
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M256Asked:
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M256Connect With a Mentor Author Commented:
I am looking in to using mod rewrite to solve this problem:
http://www.experts-exchange.com/Software/Server_Software/Web_Servers/Apache/Q_24468345.html
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caterham_wwwCommented:
> Can I disable them with PHP if it finds something in the DB?

If you use mod_php (i.e. no cgi/fastcgi solution). yes.

php:
apache_setenv('dontlog', '1');

and in your apache configuration
You should find a line starting with

CustomLog logs/access_log combined
(or similar). Change it to
CustomLog logs/access_log combined env=!dontlog


> And/or, can we disable logging 404 messages altogether for Apache?

No, only with a (simple) self-written solution (c module, mod_perl) since you can't set an env after the handler runs with the directives provided by apache.
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M256Author Commented:
I implemented your solution, yet still see the error messages in my log.

To confirm, I put this in my dnserror script:
apache_setenv('dontlog', '1');

In my logs I changed the applicable CustomLog to this:
CustomLog "logs/access.log" common env=!dontlog
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