(PHP 4 >= 4.3.0, PHP 5)
ob_get_clean — Get current buffer contents and delete current output buffer
Gets the current buffer contents and delete current output buffer.
ob_get_clean() essentially executes both ob_get_contents() and ob_end_clean().
Returns the contents of the output buffer and end output buffering. If output buffering isn't active then FALSE is returned.
Example#1 A simple ob_get_clean() example
<?php
ob_start();
echo "Hello World";
$out = ob_get_clean();
$out = strtolower($out);
var_dump($out);
?>
上例将输出：
string(11) "hello world"