: This is the most reliable way to format data. It takes an array and automatically handles commas, double quotes, and line breaks to ensure the resulting CSV is valid.
: Writing to php://output ensures that data is sent to the user row-by-row rather than being stored in a massive memory-heavy string. php mysql query download csv
: Instead of creating a physical file on the server, this opens a "write-only" stream directly to the browser's output buffer. : This is the most reliable way to format data