Why would apc_store() return false?

Question

The documentation on php.net is very spotty about causes of failure for APC writes. What kind of scenarios would cause a call to apc_store() to fail?

There's plenty of disk space available, and the failures are spotty. Sometimes the store operation will succeed and sometimes it'll fail.

Answer 1

For php cli it needs to be enabled with another option: apc.enable_cli=On

In my situation it was working when running from a webbrowser, but not when executing the same stuff with php cli.

Answer 2

I had exactly the same situation.

I migrated my code from using Cron Jobs, to using Gearman Workers, which were managed through supervisord.

Everything Broke. I couldn't ever get caches to work through APC, and had to revert back to using filebase caching.

Eventually I figured out that when I was using cron jobs, I would load each page via wget, rather than command line. This difference, meant that supervisord, which would load my PHP scripts via command line, wouldn't work, because by default APC will not work through command line.

The fix....

apc.enable_cli=On

Answer 3

out of memory (allocated memory for apc, that is)