Instant yet Simple PHP notification with HTML5 Server-Sent Events
sse.php
<?php
$dbconn = new PDO("pgsql:host=localhost;dbname=mydb", "pduser", "userpass");
$dbconn->exec('LISTEN "channel_name"'); // those doublequotes are very important
header("X-Accel-Buffering: no"); // disable ngnix webServer buffering
header("Content-Type: text/event-stream");
header("Cache-Control: no-cache");
ob_end_flush(); // close PHP output buffering
$inc=0;
while (1) {
$result = "";
// wait for one Notify 10seconds instead of using sleep(10)
$result = $dbconn->pgsqlGetNotify(PDO::FETCH_ASSOC, 10000);
if ( $result ) {
echo "id: $inc\ndata: ".stripslashes(json_encode($result))."\n\n";
$inc++;
}
flush();
}
?>
Tested with HTML+JS sample file from Mozilla web site (ssedemo.php)
pg_get_notify
(PHP 4 >= 4.3.0, PHP 5, PHP 7)
pg_get_notify — Ping database connection
Description
array pg_get_notify
( resource
$connection
[, int $result_type
] )
pg_get_notify() gets notify message sent by
NOTIFY SQL command. To recieve nofigy
messages, LISTEN SQL command must be
issued. If there is notify message on the connection, array
contains message name and backend PID is returned. If there is no
message, FALSE is returned.
See also pg_get_pid()
Example #1 PostgreSQL NOTIFY message
<?php
$conn = pg_pconnect ("dbname=publisher");
if (!$conn) {
echo "An error occured.\n";
exit;
}
// Listen 'author_updated' message from other processes
pq_query($conn, 'LISTEN author_updated;');
$notify = pg_get_notify($conn);
if (!$notify)
print("No messages\n");
else
print_r($notify);
?>
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User Contributed Notes 1 note
glococo at gmail dot com ¶
3 months ago
