Content-Disposition: attachment : Tells the browser to download the file rather than viewing it inline.
Place downloadable files outside your public HTML directory (e.g., /var/www/private/ ). download file code in php
Ensure
Using readfile() loads the entire file into PHP memory. This causes crashes with large files. Use a chunked stream approach instead. download file code in php
Allowing users to download files via PHP can introduce severe vulnerabilities like if input is not sanitized. 1. Never Trust User Input Do not pass raw $_GET variables directly into file paths. download file code in php
Content-Length : Helps the browser calculate the download progress bar. Memory-Efficient Download Method for Large Files
Your (Apache or Nginx) to leverage native file-acceleration extensions.
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