connection_aborted
Good idea for DB engines like MySQL with MyISAM which do not support transactions. But imagine that user requests a page with many (hundred) image thumbnails. Or if a PDF is generated from a HTML on-the-fly. This usually takes several minutes and if the user does not want to wait and aborts connection - PHP continues until all work is done.
In my opinion it will be MUCH more smarter (PHP is mature enough) to use signalling and terminate script immediately when connection is aborted instead of making presumptions that script author will continuously doing output and periodically flushing output buffer just in order to detect connection abort.
Mhm ....
connection_status
(PHP 4, PHP 5)
connection_status — Returns connection status bitfield
Description
int connection_status
( void
)
Gets the connection status bitfield.
Return Values
Returns the connection status bitfield, which can be used against the CONNECTION_XXX constants to determine the connection status.
See Also
- connection_aborted()
- ignore_user_abort()
- Connection Handling for a complete description of connection handling in PHP.
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User Contributed Notesconnection_status
ivo_gelov at gmx dot net
09-Apr-2008 01:01
09-Apr-2008 01:01
Michael
21-Mar-2005 12:59
21-Mar-2005 12:59
Yes it is true. I made some experiments with that functions 'connection_abortes()'. First a source made an error, which I see. They wrote: ignore_user_abort();
But that only gives you the status of the 'Abort-Setting'.
So I try (with little hope)
'ignore_user_abort(true);'
And as I readout the setting it has changed it...
Next I see that the script runs after I disconnect with the site. But other experiments fail. I try some things and then it
was logical after an experiment: flush() is one of the necessary things. Without those output to the client the function
'connection_aborted()' stays on 'false'
The Second is that you have to output something. Without that it also doesn't works.
So I now know that you have to echo something and then output the buffer. Only then 'the Script' (or the function)
'knows' that the client is disconnected.
toppi at kacke dot de
16-Jun-2004 12:06
16-Jun-2004 12:06
Notice !
if you running a loop (while, foeach etc..) you have to send something to the browser to check the status.
Example:
while(1){
if (connection_status()!=0){
die;
}
}
doesnt work, if the user break/close the browser.
But a:
while(1){
Echo "\n"; //<-- send this to the client
if (connection_status()!=0){
die;
}
}
will work :)
i hope it will help some of you to safe some time :)
Toppi
carlos at fischerinformatica dot com dot br
30-Jan-2002 09:58
30-Jan-2002 09:58
Very very useful!
I was building a chat and I wanted my script to detect when the browser was closed, so the user could be deleted from the online_users table.
<?
echo str_repeat(" ",300);
ignore_user_abort(true); //this way, the user can stop the output, but not the script.
while (true) {
echo "test<br>\n";
flush();
sleep(2);
if (connection_status()!=0){
include ('dbconnect.inc');
$sql="delete from online_users where online_user=$user";
$sql_exec=pg_exec($vChatDB, $sql);
die(); //kills the script
}
}
?>
