Php Send File To !!top!! Download -

: Informs the browser of the file size, allowing it to display an accurate progress bar. Basic Implementation with readfile()

: The most critical header. Setting it to attachment forces the download, while filename="..." suggests the default name for the saved file. php send file to download

For small to medium files, the readfile() function is the most straightforward method. It reads a file and writes it directly to the output buffer. : Informs the browser of the file size,

Use code with caution. Handling Large Files Efficiently PHP readfile vs. file_get_contents - Stack Overflow For small to medium files, the readfile() function

Using PHP to send a file for download is a core skill for web developers, often used for providing PDF reports, CSV exports, or protected digital assets. By utilizing specific HTTP headers, you can bypass the browser's default behavior—like opening an image or PDF in a new tab—and force a "Save As" dialog. The Core Mechanism: HTTP Headers

The process relies on the header() function to send instructions to the browser before any file data is transmitted.

: Tells the browser what the file is (e.g., application/pdf ). For generic binary files, application/octet-stream is often used to ensure the browser doesn't try to execute it.