How can buffering output with ob_start() affect the behavior of readfile() in PHP?

Buffering output with ob_start() can affect the behavior of readfile() by preventing the file content from being sent directly to the output. This can cause issues such as incomplete file downloads or corrupted files. To solve this issue, you can use ob_end_clean() to flush the output buffer before calling readfile(). 

ob_start();
// Your code here

// Flush the output buffer
ob_end_clean();

// Now you can safely use readfile()
readfile('file.txt');

Keywords

ob_start readfile buffering output behavior

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