13.4 Reusing buffers: ob_flush() and ob_clean()This is NOT the latest copy of this book; click here for the latest version.
void ob_flush ( void )
void ob_clean ( void )
The functions ob_end_flush() and ob_end_clean() are complemented by ob_flush() and ob_clean() - these do the same jobs as their longer cousins, with the difference that they do not end the output buffer. We could rewrite the previous script like this:
<?php
ob_start();
print "Hello First!\n";
ob_flush();
print "Hello Second!\n";
ob_clean();
print "Hello Third!\n";
?>
This time the buffer is flushed but left open, then cleaned and still left open, and finally automatically closed and flushed by PHP as the script ends - this saves creating and destroying output buffers. Reusing buffers like this is about 60% faster than opening and closing buffers all the time, and is a smart move if you ever find yourself in this situation.
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