How to use follow jump in php curl

php curl uses the follow jump method: 1. Create a new curl resource; 2. Set the URL to be requested; 3. Set the follow jump option; 4. Set curl to save the response after execution. variable instead of direct output; 5. Send a request and get the response; 6. Get the URL after the final jump; 7. Close the curl resource; 8. Output the URL after the final jump and the response content.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

In PHP programming, we often encounter situations where we need to send HTTP requests and handle follow-up jumps. Among them, curl is a very commonly used HTTP request library that can easily complete this task.

In PHP programming, we often encounter situations where we need to send HTTP requests and handle follow-up jumps. Among them, curl is a very commonly used HTTP request library that can easily complete this task.

First, we need to make sure that the curl extension is enabled in PHP. You can check whether the curl extension is enabled through the phpinfo() function.

Before using curl, we need to understand some basic curl configuration options. Among them, the CURLOPT_FOLLOWLOCATION option is the key we need to implement follow-up jumps. This option tells curl to automatically jump to a new URL when it receives an HTTP redirect response from the server.

The following is a sample code that demonstrates how to use curl to send a GET request with a following jump and obtain the URL and response content after the final jump.

//创建一个新的curl资源
$ch=curl_init();
//设置要请求的URL
$url="http://example.com/redirect.php";//这个URL包含了重定向操作
curl_setopt($ch,CURLOPT_URL,$url);
//设置跟随跳转选项
curl_setopt($ch,CURLOPT_FOLLOWLOCATION,true);
//设置curl执行后将响应保存到变量中，而不是直接输出
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
//发送请求并获取响应
$response=curl_exec($ch);
//获取最终跳转后的URL
$finalUrl=curl_getinfo($ch,CURLINFO_EFFECTIVE_URL);
//关闭curl资源
curl_close($ch);
//输出最终跳转后的URL和响应内容
echo"FinalURL:".$finalUrl."
";
echo"Response:".$response;
?>

In the above example code, we first create a curl resource and set the URL to be requested. Then, the follow jump option and the option to save the response into a variable are set by calling the curl_setopt function. Next, we use the curl_exec function to send the request and get the response. Finally, we use the curl_getinfo function to obtain the final jump URL, then close the curl resource and output the result.

Through the above example code, we can use curl to easily implement the follow jump function in PHP, so that when we need to process the jump request, we can obtain the final jump URL and response content. This is useful for crawlers, website testing, or other scenarios that need to handle redirects

When using cURL’s follow redirect feature, you need to pay attention to the following:

Default case, cURL doesn't follow redirects. Only set the curl_setopt function cURL will only follow the redirect when the CURLOPT_FOLLOWLOCATION parameter is true.

You also need to pay attention to some issues when capturing the redirect URL, such as whether you need to call the curl_close() function to close the session after processing.

Due to different network environments, problems such as the failure of the follow jump function may occur. Therefore, it is necessary to master the use of this function flexibly in practice.

Through the above example code, we can use curl to easily implement the follow jump function in PHP, so that when we need to process the jump request, we can obtain the final jump URL and response content. This is useful for crawlers, website testing, or other scenarios where redirects need to be handled

The above is the detailed content of How to use follow jump in php curl. For more information, please follow other related articles on the PHP Chinese website!