PHP function introduction—curl_error(): Get error information of cURL request

PHP function introduction—curl_error(): Get error information of cURL request

In the process of using PHP to make network requests, we usually use the cURL library to send HTTP requests. The cURL library provides a wealth of functions and options that allow us to easily create and process various types of network requests. One of the very useful functions is curl_error(), which is used to obtain error information from cURL requests.

Introduction
When using cURL to send HTTP requests, you may sometimes encounter various problems, such as network connection failure, server errors, etc. The cURL library will store these error messages, and we can obtain these error messages through the curl_error() function. The curl_error() function is very simple to use. It only requires one parameter, which is the cURL resource handle, and it will return a string representing the error information of the request. If no errors occurred with the request, an empty string is returned.

Sample code
The following is a simple sample code that demonstrates how to use the curl_error() function to obtain the error information of the cURL request:

// 创建cURL资源句柄
$ch = curl_init();

// 设置请求的URL
curl_setopt($ch, CURLOPT_URL, "https://example.com");

// 发送HTTP请求，将结果直接输出到页面
curl_exec($ch);

// 获取错误信息并打印
$error = curl_error($ch);
if($error){
  echo "请求发生错误：".$error;
}

// 关闭cURL资源句柄
curl_close($ch);

In the above code, first we A cURL resource handle is created through the curl_init() function. Then the requested URL is set through the curl_setopt() function. Here we request a non-existent URL "https://example.com". Immediately afterwards, an HTTP request is sent through the curl_exec() function. Note that we do not use the curl_error() function to obtain error information here. Finally, we use the curl_error() function to obtain error information and determine whether an error occurred. If an error occurs, an error message is printed.

It should be noted that the curl_error() function must be called after curl_exec() is executed, because the cURL library will save error information only after the HTTP request is sent.

Summary
The curl_error() function is a very useful function, which can help us quickly locate and solve errors in cURL requests. By using this function, we can remind users of possible problems in the request and locate errors more efficiently during debugging. Therefore, when using cURL to send HTTP requests, we should make full use of the curl_error() function to obtain and handle possible error information.

I hope this article will help you understand and use the curl_error() function. If you have any questions about the PHP function introduction—curl_error(), please leave a message for discussion. Thanks!

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