What are the potential pitfalls of using the flush() function in PHP?

Using the flush() function in PHP can potentially cause performance issues by sending output to the browser before the script has completed execution. This can result in incomplete or incorrect data being displayed to the user. To avoid this, it is recommended to use output buffering to store the output and then flush it all at once at the end of the script execution.

ob_start();

// Your PHP code here

ob_end_flush();