What are the potential pitfalls of using the ob_start() and ob_get_contents() functions in PHP?

When using ob_start() and ob_get_contents() in PHP, one potential pitfall is forgetting to call ob_end_clean() or ob_end_flush() after retrieving the output. This can lead to unexpected output being sent to the browser or stored in memory. To avoid this issue, always remember to properly end the output buffering after retrieving the contents.

ob_start();
// Output buffering code here

$content = ob_get_contents();
ob_end_clean();

// Use $content as needed