调用ob_end_flush()网页仍旧不能显示有关问题

调用ob_end_flush()网页仍旧不能显示问题？
写了一个简单的demo，理论上调用ob_end_flush()后，浏览器端应该马上显示网页，但是结果却是整个php文件运行完成才刷新出来，如下代码

PHP code

<!--

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<?php @ob_start();

include 'test.tpl.php';

@ob_end_flush();

sleep(3);

//---------------------------------
// invoke client js
$s = sprintf("\n<script>%s.%s();", 'oCar', 'updateDiv1');

// output the buffer to client
echo $s;
unset($s);
@flush();

//----------------------------------
sleep(3);
// invoke client js
$s = sprintf("\n<script>%s.%s();</script>", 'oCar', 'updateDiv2');

// output the buffer to client
echo $s;
unset($s);
@flush();

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