(PHP 5 >= 5.3.0, PHP 7)
mysqli::poll -- mysqli_poll — Poll connections
面向对象风格
&$read
, array &$error
, array &$reject
, int $sec
[, int $usec
] )过程化风格
&$read
, array &$error
, array &$reject
, int $sec
[, int $usec
] )Poll connections. 仅可用于 mysqlnd。 The method can be used as static.
readList of connections to check for outstanding results that can be read.
errorList of connections on which an error occured, for example, query failure or lost connection.
rejectList of connections rejected because no asynchronous query has been run on for which the function could poll results.
secMaximum number of seconds to wait, must be non-negative.
usecMaximum number of microseconds to wait, must be non-negative.
Returns number of ready connections upon success, FALSE otherwise.
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));
?>
以上例程会输出：
Array
(
[0] => test
)