mysqli::poll

mysqli_poll

(PHP 5 >= 5.3.0, PHP 7)

mysqli::poll -- mysqli_poll — Poll connections

Description

Object oriented style

public static mysqli::poll ( array &$read , array &$error , array &$reject , int $sec [, int $usec = 0 ] ) : int

Procedural style

mysqli_poll ( array &$read , array &$error , array &$reject , int $sec [, int $usec = 0 ] ) : int

Poll connections. Available only with mysqlnd. The method can be used as static.

Parameters

read

List of connections to check for outstanding results that can be read.

error

List of connections on which an error occured, 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.

sec

Maximum number of seconds to wait, must be non-negative.

usec

Maximum number of microseconds to wait, must be non-negative.

Return Values

Returns number of ready connections upon success, FALSE otherwise.

Examples

Example #1 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