PHP equivalent for ASP statement

What is the PHP equivalent for an ASP [b]Response.Flush[/b] statement?

Basically, ASP allows the HTTP response back to the client to be buffered. There are several reasons to do this, but this also allows the ASP code to later decide to either start over, by clearing the buffer (via [b]Response.Clear[/b]), or to explicitly send the accumulated content of the buffer before the ASP code actually ends executing. That is what the above statement does.

Can the equivalent be done in PHP?

Also in #PHP _↴