Copyright 1997-2022 the PHP Documentation Group.
mysqli::poll
mysqli_poll
Poll connections
Description
Object-oriented style
public static int|false mysqli::poll(array|null read,
array|null error,
array reject,
int seconds,
int microseconds= =0);
Procedural style
int|false mysqli_poll(array|null read,
array|null error,
array reject,
int seconds,
int microseconds= =0);
Poll connections. The method can be used as static.
Available only with mysqlnd.
Parameters
-
read
List of connections to check for outstanding results that can be read.
-
error
List of connections on which an error occurred, for example, query failure or lost connection.
-
reject
List of connections rejected because no asynchronous query has been run on for which the function could poll results.
-
seconds
Maximum number of seconds to wait, must be non-negative.
-
microseconds
Maximum number of microseconds to wait, must be non-negative.
Return Values
Returns number of ready connections upon success,
false
otherwise.
Examples
Example 3.58 A
mysqli_poll
example
<?php
$link1 = mysqli_connect();
$link1->query("SELECT 'test'", MYSQLI_ASYNC);
$all_links = array($link1);
$processed = 0;
do {
$links = $errors = $reject = array();
foreach ($all_links as $link) {
$links[] = $errors[] = $reject[] = $link;
}
if (!mysqli_poll($links, $errors, $reject, 1)) {
continue;
}
foreach ($links as $link) {
if ($result = $link->reap_async_query()) {
print_r($result->fetch_row());
if (is_object($result))
mysqli_free_result($result);
} else die(sprintf("MySQLi Error: %s", mysqli_error($link)));
$processed++;
}
} while ($processed < count($all_links));
?>
The above example will output:
Array ( [0] => test )
See Also
mysqli_query
|
mysqli_reap_async_query
|