PHP function introduction—curl_multi_setopt(): Set multiple cURL options

PHP function introduction—curl_multi_setopt(): Set multiple cURL options

The curl_multi_setopt() function in PHP is a function used to set multiple cURL options. When using cURL to make multiple concurrent requests, we can use this function to set multiple options to more flexibly control requests and obtain responses. This article will introduce the usage of curl_multi_setopt() function in detail and provide corresponding code examples.

cURL is a very powerful tool for data transfer and communication with the server. It supports multiple protocols, including HTTP, HTTPS, FTP, etc., and provides a wealth of options and functions to customize and control network requests. cURL provides the curl_setopt() function to set options for a single request, while the curl_multi_setopt() function is used when processing multiple requests at the same time.

The syntax of the curl_multi_setopt() function is as follows:

bool curl_multi_setopt ( resource $mh , int $option , mixed $value )

Parameter explanation:

• $mh is a function composed of curl_multi_init() The cURL multiple request handles returned by the function.
• $option is the option to be set, which can be a curl_multi constant.
• $value is the value of the option, depending on which option is set.

The following are some commonly used curl_multi options and their descriptions:

• CURLMOPT_PIPELINING: Enable or disable HTTP piping requests. If enabled, multiple requests will be sent simultaneously on the same TCP connection.
• CURLMOPT_MAXCONNECTS: Set the maximum number of connections that can be opened simultaneously.
• CURLMOPT_MAX_TOTAL_CONNECTIONS: Set the maximum total number of connections allowed.
• CURLMOPT_MAX_HOST_CONNECTIONS: Set the maximum number of host connections allowed.
• CURLMOPT_MAX_PIPELINE_LENGTH: Set the maximum number of requests that can be sent simultaneously in the HTTP pipeline.

Here is a sample code to set multiple options using curl_multi_setopt():

//创建cURL多个请求句柄
$multiHandle = curl_multi_init();

//设置管道请求开启
curl_multi_setopt($multiHandle, CURLMOPT_PIPELINING, 1);

//设置允许的最大总连接数
curl_multi_setopt($multiHandle, CURLMOPT_MAX_TOTAL_CONNECTIONS, 10);

//设置允许的最大主机连接数
curl_multi_setopt($multiHandle, CURLMOPT_MAX_HOST_CONNECTIONS, 5);

//设置HTTP管道中能够同时发送请求的最大数量
curl_multi_setopt($multiHandle, CURLMOPT_MAX_PIPELINE_LENGTH, 3);

In the above example, we first pass the curl_multi_init() function Created a cURL multiple request handle. Then use the curl_multi_setopt() function to set multiple options. Here we set the pipeline request to be enabled, the maximum total number of connections allowed to be 10, the maximum number of host connections allowed to be 5, and the maximum number of requests that can be sent simultaneously in the HTTP pipeline to 3.

By setting these options appropriately, multiple requests initiated by cURL can be made more efficient and the request throughput can be improved.

Summary: curl_multi_setopt() The function is a function in PHP used to set multiple cURL options. Use it to have more flexible control and customization of cURL multiple requests. Properly setting options in concurrent requests can improve request efficiency and performance. I hope this article can help you better use the curl_multi_setopt() function and understand the application of cURL in PHP.

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