ob_flush(), flush() not working from WAMP2 on Windows 7

This snippet:

ob_start();

for($i=0;$i<70;$i++)
{
    echo 'printing...<br />';
    ob_flush();开发者_Go百科
    flush();

    usleep(300000);
}

From this page: http://www.php.net/manual/en/function.flush.php#85382

Isn't working on WAMP2 (PHP 5.3.0, Apache 2.2.11) installed on Windows 7, browsing from http://localhost with IE 8, FF 6.0.2 and Chrome 13.

None of them worked. All the 'printing...' lines are just output in one instant batch when the page finished processing.

output_buffering in php.ini is set to 'On'.

Any ideas why it isn't working?

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Several reasons why flush fails are discussed on the ob_flush() documentation page (eg interference with certain antivirus sw's, interference with zlib compression, ...). Worth reading.

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You may need to close the session:

echo 'printing...<br />';

session_write_close();

ob_flush();
flush();