The whole category in one page.
THE VERSION
Use a current supported one. Newer is faster and receives security updates.
Back up and test before changing.
If something breaks, revert and read the error log. It names the file.
THE SETTINGS THAT MATTER
- Memory limit: raise modestly when an error names it
- Upload and post size: both, and post must be larger
- Execution time: for imports and backups, not for pages visitors load
- Max input vars: raise when settings silently fail to save
THAT LAST ONE
The most confusing problem in this category. No error appears; the submission is simply truncated.
Suspect it whenever something saves partially.
FOR DIAGNOSIS
The error log names the type, the message, the file and the line.
That combination identifies the cause almost every time.
FOR A BLANK PAGE
Fatal error with display off. Check the log.
FOR A 500 ERROR
Log first, then .htaccess, then permissions.
WHAT NOT TO DO
Raise limits repeatedly without asking why Enable every extension Leave error display on
