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Editorial Team
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Asked: 2026-05-25T13:36:26+00:00

This snippet: ob_start(); for($i=0;$i<70;$i++) { echo ‘printing…<br />’; ob_flush(); flush(); usleep(300000); } From this

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This snippet:

ob_start();

for($i=0;$i<70;$i++)
{
    echo 'printing...<br />';
    ob_flush();
    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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1 Answer

  1. Editorial Team

    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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