You will need to add "ignore_user_abort(true);" on top of the PHP script, and to call "ob_flush()" after echoing something from script (For why see PHP flush() man page). Working example (proof of concept):
<?php
ignore_user_abort(true);
function log_message($s, $ss) {
$myFile = "log.txt";
$fh = fopen($myFile, 'a') or die("can't open file");
$stringData = $s . ": " . $ss . "
";
fwrite($fh, $stringData);
fclose($fh);
}
for ($i=0;$i<5;$i++) {
echo "<br>";
//flush();
ob_flush();
if (connection_aborted()) {
log_message('error1', connection_status());
exit;
}
else {
log_message('error2', connection_status());
}
sleep(1);
}
P.S. connection_status() returns 0 if connection is still active, and in case of closed one returns 1.
EDIT:
My bad. Call both flush() and ob_flush() (please read flush() man page, link above, and answers from this topic), or otherwise might not work, depending on server/php configuration.
The following code was tested on WAMP with PHP 5.3.8 (works without calling flush()), and now on Ubuntu with PHP 5.3.10. where flush() call before ob_flush() is necessary.
Full code for testing:
index.html:
<html>
<head>
<script src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
<script>
$(document).ready(function() {
$.ajax({
url: "script.php",
context: document.body
}).done(function(data) {
alert(data);
});
})
</script>
</head>
<body>
</body>
</html>
script.php:
ignore_user_abort(true);
function log_message($type, $message, $file = 'log.txt') {
$fh = fopen($file, 'a') or die("can't open file");
$conn_status = connection_status();
if($conn_status === CONNECTION_NORMAL) {
$status = 'normal';
} elseif($conn_status === CONNECTION_ABORTED) {
$status = 'aborted';
} else {
$status = 'timeout';
}
$aborted = connection_aborted() ? 'yes' : 'no';
$data = $type . ': ' . $message . "
";
$data .= 'Connection status: ' . $status . "
";
$data .= 'Aborted: ' . $aborted . "
";
fwrite($fh, $data);
fclose($fh);
}
for ($i = 0; $i < 10; $i++) {
echo "<br>";
flush();
ob_flush();
if (connection_aborted()) {
log_message('Error', 'Connection closed by user!');
exit;
}
else {
log_message('Info', 'Everything is fine. Move along...');
}
sleep(1);
}
After you call index.html page, and close tab or whole browser you should see in log.txt file next info:
Info: Everything is fine. Move along...
Connection status: normal
Aborted: no
Info: Everything is fine. Move along...
Connection status: normal
Aborted: no
Info: Everything is fine. Move along...
Connection status: normal
Aborted: no
Error: Connection closed by user!
Connection status: aborted
Aborted: yes
