connection_aborted

(PHP 4, PHP 5)

connection_abortedÜberprüft, ob die Verbindung zum Client beendet wurde

Beschreibung

int connection_aborted ( void )

Überprüft, ob die Verbindung zum Client beendet wurde.

Rückgabewerte

Gibt 1 zurück, falls die Verbindung zum Client beendet wurde, und andernfalls 0.

Siehe auch

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User Contributed Notes 4 notes

up
6
nathanb at php dot net
1 year ago
A trick to detecting if a connection is closed without having to send data that will otherwise corrupt the stream of data (like a binary file) you can use a combination of chunking the data on HTTP/1.1 by sending a "0" ("zero") as a leading chunk size without anything else.

*NOTE* it's important to note that it's not a good idea to check the stream more then once every few seconds. By doing this you are potentially increasing the data sent to the user with no gain to the user.

A good reason to do it this way is if you are generating a report that takes a long time to run and takes a lot of server resources. This would allow the server to detect if a user canceled the download and do any cleanup without corrupting the file file being download.

Here is an example:

<?php
ignore_user_abort
(true);
header('Transfer-Encoding:chunked');
ob_flush();
flush();
$start = microtime(true);
$i = 0;
// Use this function to echo anything to the browser.
function vPrint($data){
    if(
strlen($data))
        echo
dechex(strlen($data)), "\r\n", $data, "\r\n";
   
ob_flush();
   
flush();
}
// You MUST execute this function after you are done streaming information to the browser.
function endPacket(){
    echo
"0\r\n\r\n";
   
ob_flush();
   
flush();
}
do{
    echo
"0";
   
ob_flush();
   
flush();
    if(
connection_aborted()){
       
// This happens when connection is closed
       
file_put_contents('/tmp/test.tmp', sprintf("Conn Closed\nTime spent with connection open: %01.5f sec\nLoop itterations: %s\n\n", microtime(true) - $start, $i), FILE_APPEND);
       
endPacket();
        exit;
    }
   
usleep(50000);
   
vPrint("I get echo'ed every itteration (every .5 second)<br />\n");
}while(
$i++ < 200);
endPacket();
?>
up
0
phpcoder at cyberpimp dot techlab dot info
7 years ago
Although the documentation indicates it returns an int, I found comparing the return value with numeric values does not seem to work.

Example (does not work):
<?php
if (connection_aborted()==1) {
fwrite($filehandle, 'aborted!');
}
?>

You're better off just assuming it returns boolean

Example (does work):
<?php
if (connection_aborted()) {
fwrite($filehandle, 'aborted!');
}
?>
up
-1
rickyale at ig dot com dot br
4 years ago
(connection_aborted not working)
I had this problem years ago, now the problem came back after upgrading php... i tried everything i found and in the end the function ob_end_flush();  on top of script as post in php bug track solved the problem. Im using windows 7 x64 / php 5.2.4 / apache 2.2.14 (win32)

try adding ob_end_flush(); on top of you script.
i read something about this but can't remember where, it was related to a bug or something.

hope this help.
up
-1
Luciano
4 years ago
In order to detect a disconnection inside the script we need to flush the buffer (it is only when the the server tries to send the buffer content that it will see that the connection is broken).

Thus we need to use the ob_implicit_flush() function to flush automatically the buffer

This is an example of a disconnection detection :

<?php
 
// enables the automatic flush
 
ob_implicit_flush();

  function
verifyCommunication() {
   
$status = (connection_aborted()?"not ":"") ."sent";
   
persistCommunication(new Communication($status));
  }

 
// we will check the communication state when the script finished
 
register_shutdown_function(verifyCommunication);
  echo
"blabla";
 
// this sleep is used to have time to break the connection on the client side
 
sleep(10);
  echo
"tata";
?>

I use such a process to cancel a request if the client didn't get the acknowledgement because he will redo his request...
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