在没有函数原型之外的任何文档的情况下，我都在努力寻找mysqli_poll（）函数的第三个参数是什么。
int mysqli_poll (
array &$read ,
array &$error ,
array &$reject ,
int $sec
[, int $usec ] )
查看（C）源代码，它似乎在$ reject数组中填充了以下资源：
CONN_GET_STATE((*p)->data) <= CONN_READY
|| CONN_GET_STATE((*p)->data) == CONN_QUIT_SENT
这是否意味着与服务器的连接正在关闭/关闭？
还有别的吗
是否应该预先填充用于检查断开连接的资源？还是将它们从$ read和$ error中自动添加？
我建立了一个测试平台：
$l1 = mysqli_connect();
$l2 = mysqli_connect();
$l3 = mysqli_connect();
$s1 = "SELECT CURTIME()";
$s2 = "SELECT * FROM"; // will error #1064
$s3 = "SELECT SLEEP(10), CURTIME()";
mysqli_query($l1, $s1, MYSQLI_ASYNC);
mysqli_query($l2, $s2, MYSQLI_ASYNC);
mysqli_query($l3, $s3, MYSQLI_ASYNC);
$started=time();
for ($x=0; $x<5; $x++) {
$ready=$reject=$errors = array($l1, $l2, $l3);
print "\niteration $x at t+" . (time()-$started) . "\n";
mysqli_poll($ready, $errors, $reject, 3);
print "ready = " . count($ready) . "\n";
foreach($ready as $r) {
$c=mysqli_reap_async_query($r);
print "err=" . mysqli_error($r) . " cnt=" . count($c) . "\n";
};
print "errors = " . count($errors) . "\n";
print "reject = " . count($reject) . "\n";
sleep(4);
}
结果（以//开头的注释）：
iteration 0 at t+0
ready = 1 // appears to be SELECT CURTIME()
err= cnt=1
errors = 0
reject = 0
iteration 1 at t+4
ready = 1 // appears to be SELECT * FROM
err=You have an error in your SQL syntax; check the manual that corresponds
to your MySQL server version for the right syntax to use near '' at line
1 cnt=1
errors = 0
reject = 1 // appears to be SELECT CURTIME() (results reaped)
iteration 2 at t+8
ready = 1 // appears to be SELECT SLEEP(10) despite 8 seconds elapsed
err= cnt=1
errors = 0
reject = 2 // appears to be SELECT CURTIME() + SELECT * FROM
iteration 3 at t+14
ready = 0
errors = 0
reject = 3
iteration 4 at t+21
ready = 0
errors = 0
reject = 3
即$ reject填充了已经获得结果的链接，而不是尚未准备好轮询的链接。
尝试使用无效的连接，该值将从所有数组中删除（未添加到$ reject中），
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