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(PHP 4, PHP 5)
ob_implicit_flush — 打开/关闭绝对刷送
$flag
= true
] )ob_implicit_flush() 将打开或关闭绝对(隐式)刷送。绝对(隐式)刷送将导致在每次输出调用后有一次刷送操作,以便不再需要对 flush() 的显式调用。
flag
设为 TRUE
打开绝对刷送,反之是 FALSE
。
没有返回值。
[#1] Pedro Gimeno [2015-02-22 18:11:54]
Note that the name ob_implicit_flush is misleading. Despite its name, this function does NOT work with the user output buffer, i.e. the one that the rest of the ob_* functions work with. It will NOT do an automatic ob_flush(). It will do an automatic flush(). Different things.
For example, the following script:
<?php
ob_implicit_flush();
for($i = 0; $i < 10; $i++)
{
echo "$i\n";
sleep(1);
}
?>
will be equivalent to this one:
<?php
for ($i = 0; $i < 10; $i++)
{
echo "$i\n";
flush();
sleep(1);
}
?>
That script will not output anything until the end, if 'output_buffering' is set to 'on' in php.ini. Unfortunately, there is no way to do an implicit ob_flush() after each output, that I am aware of.
If you want the output to come out as it is generated, one solution is to *also* add ob_end_clean() or ob_end_flush() to the beginning of the script:
<?php
ob_end_flush();
ob_implicit_flush();
for ($i = 0; $i < 10; $i++)
{
echo "$i\n";
sleep(1);
}
?>
This will output as it goes. This is only a problem if you only want one part of the output to come out in real time, and want the rest buffered. In that case, since there's no function to do an implicit ob_flush() every time, you need to call it explicitly. For example, this works:
<?php
ob_start(); // not needed if output_buffering is on in php.ini
ob_implicit_flush(); // implicitly calls flush() after every ob_flush()
echo "This output is buffered.\n";
echo "As is this.\n";
for ($i = 0; $i < 10; $i++)
{
echo "$i\n";
ob_flush();
sleep(1);
}
?>
Note also that some browsers may wait until they have a certain amount of output. See flush [ http://php.net/manual/en/function.flush.php ] for details. It was my case with Firefox (Iceweasel 17.0); unless I output 1024 bytes at the beginning, it does not begin to output.
[#2] rocca at start dot ca [2007-10-09 11:42:45]
You can also get the unbuffered output with Linux/Apache without having to do the implicit flush after each line by calling:
ob_implicit_flush(true);
ob_end_flush();
...at the start of the script.
[#3] Paul Yanchenko [2006-01-21 16:15:05]
There is another workaround for ob_implicit_flush() in console. Yes, it doesn't works as expected, but you can get similar result by specifying chunk_size=2 in ob_start():
<?php
ob_start('ob_logstdout', 2);
?>
This will result that every new line (which ends with \n) will flush output buffer.
Hope this will help you.
[#4] mhumphrey at _spammenot_designvision dot com [2003-08-18 14:41:21]
From experimenting, it looks like using sessions with session.use_trans_sid=1 will force your output to be buffered regardless of this setting.
My guess is that this is so PHP can hunt for URLs in your output to automatically add the Session ID to them. It must wait until script output is complete before it starts that replacement, rather than doing it "on the fly".
When i comment out my session_start() line, i get continuous output to the browser. Put it back in, and i only see the page when it's completely loaded. Change session.use_trans_sid = 0 and i get continuous output again.
[#5] calimero at Creatixnet dot com [2003-07-07 12:00:07]
######### BEWARE ##########
There is a bug (or at least an unexpected feature of ob_implicit_flush) that has been already discussed on the PHP bugtracker :
http://bugs.php.net/bug.php?id=23877
http://bugs.php.net/bug.php?id=16676
Code like this WILL NOT work :
<?php
// This will not work as expected on Linux.
ob_implicit_flush (1);
for($i=0;$i<10;$i++) {
echo "grrrrrrrrrr\n";
sleep(1);
}
?>
This feature happens on Linux versions of PHP, in all versions of php4 prior to 4.3.3 (don't know yet for the next ones) but also in php5 beta1. ob_implicit_flush has NO EFFECT on command-line (console, CLI) scripts, no flushing at all will be made, all output will be sent at the end of the script.
There is a workaround using ob_end_flush() and ob_flush, here it is :
<?php
// This works !
ob_end_flush();
for($i=0;$i<10;$i++) {
echo "yeah :-))))\n";
@ob_flush();
sleep(1);
}
?>
hope this will help. It would have helped me...