$testingURL = "https://www.testing.com?......";
do {
$lastData = "";
curl_setopt($ch, CURLOPT_URL,$testingURL);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (AppleWebKit/537.3e/37.0.2062.124 Safari/537.36.....");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, 'username=testuser&password=testpwd');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_file);
curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers_curl);
curl_setopt($ch, CURLOPT_REFERER, "www.test...com");
$result = curl_exec($ch);
// sleep(3);
preg_match_all('/name="_checkkey".*?<'/td>/s',$result,$lastData);
$lastData[1] = preg_replace('/[^a-zA-Z0-9_ %'[']'.'(')%&-]/s', '', $lastData[1]);
$testingURL = "https://www.testing.com?_chkKey=".$lastData[1][0]."&chiId=".$lastData[1][1];
} while (isset($lastData[1][1]) && $lastData[1][1] == "checkOneMoreTime");
（注意：在我的代码中，我想停止执行长达 3 秒
如果我睡觉（3）（它会起作用吗），在$testingURL将测试2到3秒，然后表单将提交，同时我也想再次执行循环，
do {
$lastData = "";
$result = "";
curl_setopt($ch, CURLOPT_URL,$testingURL);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (AppleWebKit/537.3e/37.0.2062.124 Safari/537.36.....");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, 'username=testuser&password=testpwd');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_file);
curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers_curl);
curl_setopt($ch, CURLOPT_REFERER, "www.test...com");
$result = curl_exec($ch);
sleep(3);
$testingURL = "";
preg_match_all('/name="_checkkey".*?<'/td>/s',$result,$lastData);
$lastData[1] = preg_replace('/[^a-zA-Z0-9_ %'[']'.'(')%&-]/s', '', $lastData[1]);
$testingURL = "https://www.testing.com?_chkKey=".$lastData[1][0]."&chiId=".$lastData[1][1]; } while (isset($lastData[1][1]) && $lastData[1][1] == "checkOneMoreTime");