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curl_upkeep() function is a PHP function used to send HTTP requests, especially in polling applications, which has a more prominent role. Polling applications usually refer to scenarios where requests are required to continuously send requests to the server to obtain updated data, such as real-time data monitoring, chat systems, push notifications, etc. In such a scenario, the curl_upkeep() function can help developers make HTTP requests efficiently and stably.
First, let's review the basic usage of curl_upkeep() . Assuming you are already familiar with the cURL function library in PHP, then curl_upkeep() is actually an encapsulation and extension of cURL , aiming to make data requests more convenient for developers.
function curl_upkeep($url, $params = [], $method = 'GET', $headers = []) {
$ch = curl_init();
// set upcURLOptions
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
if ($method == 'POST') {
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
}
// Execute a request
$response = curl_exec($ch);
if (curl_errno($ch)) {
echo 'cURL Error: ' . curl_error($ch);
}
// closurecURLresource
curl_close($ch);
return $response;
}
In this basic example, the curl_upkeep() function receives four parameters:
$url : The requested target URL.
$params : The parameter used for POST requests, defaults to an empty array.
$method : HTTP request method, default is GET, can be set to POST.
$headers : an array of request headers to add custom HTTP headers.
In polling applications, it is often necessary to send requests regularly to get the latest data or perform certain operations. This is achieved through a timer or loop, curl_upkeep() can help you send requests and process responses.
For example, suppose you need to request the latest weather data from a server regularly and process it after getting the data. You can use curl_upkeep() to send requests.
// set up请求的URL
$url = "https://m66.net/weather_api";
// Simulate polling requests
while (true) {
// Get the latest weather data
$response = curl_upkeep($url, [], 'GET');
// Process the returned data
if ($response) {
$weatherData = json_decode($response, true);
echo "Current temperature：" . $weatherData['temperature'] . "°C\n";
}
// set up轮询间隔
sleep(60); // Every other60Request once in seconds
}
In the above code, we send a GET request via curl_upkeep() to get the weather data, and after each request, the program will wait 60 seconds before sending the next request. This is a typical polling application scenario.
In real-time data monitoring systems, the server may update data regularly. In order to obtain this data in real time, you can use polling to request the latest data from the server regularly through curl_upkeep() . For example, real-time stock market monitoring, sensor data collection and other scenarios can be achieved through curl_upkeep() .
$url = "https://m66.net/stock_data_api";
while (true) {
$stockData = curl_upkeep($url, [], 'GET');
// Process the obtained stock data
echo "Latest stock prices：" . $stockData['price'] . "\n";
sleep(10); // Every10Poll once in seconds
}
In the push notification system, the client usually checks regularly for new messages or notifications. By using the curl_upkeep() function, you can implement timed sending requests to the push service and checking for new notifications.
$url = "https://m66.net/push_notification_api";
while (true) {
$response = curl_upkeep($url, [], 'GET');
if ($response == 'new_notifications') {
echo "You have new notifications！\n";
}
sleep(30); // Every30Check once in seconds
}
The chat system needs to continuously obtain new messages from the server. Through the polling mechanism, the client can continuously request new messages from the server. This function can also be implemented efficiently through curl_upkeep() .
