(PHP 4 >= 4.3.0, PHP 5, PHP 7)
pg_get_notify — Gets SQL NOTIFY message
$connection
[, int $result_type
] ) : array
pg_get_notify() gets notifications generated by a
NOTIFY
SQL command. To receive notifications,
the LISTEN
SQL command must be
issued.
connection
PostgreSQL database connection resource.
result_type
An optional parameter that controls
how the returned array is indexed.
result_type
is a constant and can take the
following values: PGSQL_ASSOC
,
PGSQL_NUM
and PGSQL_BOTH
.
Using PGSQL_NUM
, pg_get_notify()
will return an array with numerical indices, using
PGSQL_ASSOC
it will return only associative indices
while PGSQL_BOTH
, the default, will return both
numerical and associative indices.
An array containing the NOTIFY
message name and backend PID.
As of PHP 5.4.0 and if supported by the server, the array also contains the server version and the payload.
Otherwise if no NOTIFY
is waiting, then FALSE
is returned.
Example #1 PostgreSQL NOTIFY message
<?php
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
echo "An error occurred.\n";
exit;
}
// Listen 'author_updated' message from other processes
pg_query($conn, 'LISTEN author_updated;');
$notify = pg_get_notify($conn);
if (!$notify) {
echo "No messages\n";
} else {
print_r($notify);
}
?>