SSL Certificate Verification Failures

Often, when attempting a WordPress sideload image operation from a remote server with an expired or self-signed SSL certificate, the download_url() function will fail. This results in a cURL error. If you absolutely trust the source, you can temporarily bypass SSL verification specifically for your request by hooking into the http_request_args filter.

PHP Memory Limit Exhaustion

A fatal flaw in many custom scripts is the failure to account for memory consumption during the metadata generation phase. When wp_generate_attachment_metadata() runs, WordPress uses the GD Library or ImageMagick to resize the image. To fix this, ensure your memory_limit in php.ini is set to at least 256M, or ideally 512M.

Server Execution Timeouts (HTTP 504)

When executing a function on a slow external URL, the download might take longer than your server's default max_execution_time. The script will abruptly terminate. You must implement background processing (like Action Scheduler or WP-Cron) or use AJAX batching so the queue processes one image per request.

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