PHP mysqli: poll() function
mysqli_poll function / mysqli::poll
The mysqli_poll function / mysqli::poll — Poll connections
Syntax:
Object oriented style
public static int mysqli::poll ( array &$read , array &$error , array &$reject , int $sec [, int $usec ] )
Procedural style
int mysqli_poll ( array &$read , array &$error , array &$reject , int $sec [, int $usec ] )
Parameter:
| Name | Description |
|---|---|
| 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 seconds to wait, must be non-negative. |
Usage: Procedural style
mysqli_poll(connection);
Parameter:
| Name | Description | Required/Optional |
|---|---|---|
| connection | Specifies the MySQL connection to use | Required |
Return value:
Returns number of ready connections upon success, FALSE otherwise.
Version: PHP 5, PHP 7
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));
?>
See also
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https://w3resource.com/php/function-reference/mysqli_poll.php
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