Руководство по PHP
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ob_get_clean

(PHP 4 >= 4.3.0, PHP 5)

ob_get_clean --  Get current buffer contents and delete current output buffer

Description

string ob_get_clean ( void )

This will return the contents of the output buffer and end output buffering. If output buffering isn't active then FALSE is returned. ob_get_clean() essentially executes both ob_get_contents() and ob_end_clean().

Пример 1. A simple ob_get_clean() example

<?php

ob_start();

echo "Hello World";

$out = ob_get_clean();
$out = strtolower($out);

var_dump($out);
?>

Our example will output: 

string(11) "hello world"

See also ob_start() and ob_get_contents().

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ob_flushУровень вышеob_get_contents