Ob_flush/flush's description in the manual, is to refresh the output buffer, and also need to be used, so it will cause many people confused ...
In fact, the two of them are different objects, in some cases, flush does not do anything at all.
The Ob_* series function is the output buffer that operates PHP itself.
So, Ob_flush is the buffer that refreshes PHP itself.
Flush, strictly speaking, this only works when PHP is installed as an Apache module (handler or filter). It is a buffer that refreshes the webserver (which can be considered specifically Apache).
Under Apache module's SAPI, flush will invoke Sapi_module's flush member function pointer indirectly, calling Apache's Api:ap_rflush to flush Apache's output buffer, and of course the manual says, There are some Apache other modules that may change the result of this action:
Some Apache modules, such as Mod_gzip, may make their own output caches, which will result in the flush () function producing results that are not immediately sent to the client browser.
Even the browser will cache the received content before it is displayed. For example, the Netscape browser caches content before it accepts the start of a newline or HTML tag, and receives aThe entire table is not displayed until the tag is marked.
Some versions of Microsoft Internet Explorer do not start to display the page until 256 bytes are accepted, so you must send some extra spaces to let these browsers display the page content.
So, the correct use of the two is the order. First Ob_flush, then flush,
Of course, in other sapi, do not call flush also can, only to ensure that your code portability, recommended for use.
In IE, you have to output 256 bytes before it works, the following code:
Copy CodeThe code is as follows:
function Execte () {
echo Str_pad ("", 256);
for ($i =1; $i <10; $i + +) {
echo $i. "
";
Ob_flush ();
Flush ();
Sleep (1);
}
}
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