WordPress Is Not Generating Your Thumbnails (And It Will Not Tell You)
If PHP’s image extension is missing, WordPress accepts every upload, returns success, and generates no thumbnails at all. Here is how to check yours.
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Debugging a WordPress Fatal Error With No Error Log
WP_DEBUG is off and the PHP error log is unreachable, but one admin page keeps dying. Here is how I captured the real fatal error with a shutdown handler.