我们向Web服务发出了1000次请求。每次我们提出请求时，我们都希望得到响应，但有时Web服务会失败，并且没有提供响应。当这种情况发生时，我们希望睡眠30秒，然后在最后一次失败时重新运行该循环。如何做到这一点？
以下是基本结构：
foreach ( $objects as $object ) {
foreach ( $otherObjects as $otherObject ) {
//Prepare request data from $object and $otherObjects
//Send request to webservice using cURL
//Receive response and check to see if success
if ( isset( $response ) ) {
//Save response to database
} else {
//Not successful. Sleep for 30 seconds. Send request again up to 3 times. If ultimately successful continue, if not break and alert system admin.
}
}
}
您可以将请求分解为一个函数：
foreach ( $objects as $object ) {
foreach ( $otherObjects as $otherObject ) {
$tries = 0;
//Receive response and check to see if success.
while( ($response = doRequest($object, $otherObject)) === false && $tries < 3) {
//Not successful. Sleep for 30 seconds. Send request again up to 3 times.
$tries++;
sleep(30);
}
if ( $response ) {
//Successful save response to database.
} else {
//Not successful break and alert system admin.
}
}
function doRequest($object, $otherObject) {
//Prepare request data from $object and $otherObject.
//Send request to webservice using cURL.
return $result;
}
foreach ( $objects as $object ) {
foreach ( $otherObjects as $otherObject ) {
//Prepare request data from $object and $otherObjects
//Send request to webservice using cURL
//Receive response and check to see if success
if ( isset( $response ) ) {
//Save response to database
} else {
$retriesLeft = 3;
do {
sleep(30);
// perform the request again
--$retriesLeft;
}
while (!isset($response) && $retriesLeft);
}
}
}
更新：简化版
foreach ( $objects as $object ) {
foreach ( $otherObjects as $otherObject ) {
$retriesLeft = 4;
//Prepare request data from $object and $otherObjects
do {
//Send request to webservice using cURL
//Receive response and check to see if success
if (isset($response)) {
break;
}
else {
sleep(30);
--$retriesLeft;
}
}
while (!isset($response) && $retriesLeft);
}
}