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cURL is a common HTTP request tool, which is usually used to send GET, POST requests, etc. in PHP. When multiple requests need to be made simultaneously, multiple cURL sessions may be created, each using system resources independently. The curl_share_init function provides the ability to share resources for multiple cURL sessions. By sharing certain resources (such as cookies, connections, DNS lookups, etc.), different cURL sessions can reduce the number of times new connections are created frequently, thus avoiding IP blocking.
Use curl_share_init to initialize a shared resource and set shared options. For example, we can share cookies or DNS information.
$share = curl_share_init();
curl_share_setopt($share, CURLSHOPT_SHARE, CURLSHARE_COOKIE); // shared cookies
curl_share_setopt($share, CURLSHOPT_SHARE, CURLSHARE_DNS); // shared DNS information
Next, create multiple cURL sessions and bind them to the shared resource so that they can share the same connection and other settings.
$ch1 = curl_init("http://m66.net/path/to/resource1");
$ch2 = curl_init("http://m66.net/path/to/resource2");
curl_setopt($ch1, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch2, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch1, CURLOPT_SHARE, $share);
curl_setopt($ch2, CURLOPT_SHARE, $share);
When multiple requests are performed, they share the same resources, which reduces the risk of blockade caused by frequent creation of new connections.
$response1 = curl_exec($ch1);
$response2 = curl_exec($ch2);
After the request is complete, close the cURL session and shared resources.
curl_close($ch1);
curl_close($ch2);
curl_share_close($share);
The core principle of sharing cURL resources is to avoid blockades caused by frequent requests by reducing the creation of new TCP connections. Each cURL session will independently create a new TCP connection by default. If you make multiple requests to the same target server, frequent connection creation may be detected and the blocking mechanism is triggered.
After using curl_share_init , multiple cURL sessions share the same connection resource, which effectively reduces the number of connections and duplicate DNS query requests. Less connection and resource consumption makes your request behavior look more "normal", thus reducing the risk of IP blocking.
While sharing cURL resources can help avoid frequent blockades, they are not a universal solution. Here are some things to note:
Request frequency control : Sharing cURL resources does not completely avoid IP blocking. If the request frequency is too high, the server may still trigger the blocking mechanism. It is recommended to reasonably control the request frequency, use delay mechanism or randomize the request time.
Using Proxy IP : When requests are too frequent, it is recommended to combine proxy IP to share the request pressure to avoid excessive use of a single IP.
Server response policy : Some servers may judge the requested exception behavior based on other parameters (such as User-Agent or Referer). Reasonably disguising the request header information and simulating normal user access is also an effective means to prevent IP from being blocked.
Using the curl_share_init function can avoid the problem of IP blocking to a certain extent, and is especially suitable for scenarios where a large number of the same requests are required. By sharing cURL resources, we can effectively reduce duplicate creation and DNS lookup of connections, reducing the risk of being blocked. However, relying solely on shared resources is not enough to completely avoid blockades. Reasonable control of request frequency and combined with other protection means (such as proxy IP) can further improve the stability and success rate of requests. In practical applications, developers need to consider a variety of protection strategies based on specific scenarios.
