How to set curl not to timeout in php? A brief analysis of several methods

In PHP, curl is a powerful library for sending HTTP requests. However, by default, a curl request will set a timeout after which the request will be canceled. This time defaults to 1 second. However, in some cases we may want the curl request to proceed over a longer period of time rather than canceling within the default timeout. How to set the timeout of curl request through PHP code? Here are several ways:

1. Modify the php.ini file

If you have permission to access the php.ini file, you can modify it in this file Modify curl's timeout in . In the php.ini file, find the following two options:

; Maximum amount of time (in seconds) that is allowed for cURL functions to execute.
; Note: This value should not be set to an excessive amount, as it will negatively
; affect server performance. 
; Default Value: 30
curl_timeout = 30

; The number of seconds to wait while trying to connect.
; Default Value: 60
curl_connect_timeout = 60

Among them, curl_timeout is the maximum execution time of curl request, curl_connect_timeout is the connection timeout of curl request time. You need to change their values ​​to your desired time in seconds. After the modification is completed, restart the Apache or PHP-FPM service to make it take effect.

2. Use the curl_setopt function

If you do not have permission to modify the php.ini file, you can use the curl_setopt function to set the curl timeout in the PHP code . This function is used to set the options of curl. It is used as follows:

bool curl_setopt ( resource $ch , int $option , mixed $value )

where, $ch is the handle of curl (usually initialized using the curl_init function), $option is the option that needs to be set, $value is the value of the option. There are two options for setting the timeout:

CURLOPT_TIMEOUT：curl 请求最大执行时间（以秒为单位）；
CURLOPT_CONNECTTIMEOUT：curl 请求连接超时时间（以秒为单位）。

You can use the following code to set the above options:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://example.com");
curl_setopt($ch, CURLOPT_TIMEOUT, 120); // 设置 curl 请求最大执行时间为 120 秒（2 分钟）
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30); // 设置 curl 请求连接超时时间为 30 秒
$result = curl_exec($ch);
curl_close($ch);

In the above code, we set the maximum execution of the curl request The time is 120 seconds and the connection timeout is 30 seconds. If the curl request does not complete within 120 seconds or the connection is not successfully established within 30 seconds, the request will be canceled.

3. Add parameters to the URL

If you don’t want to modify the PHP configuration or use the curl_setopt function, you can also add parameters to the URL to set curl The request timeout. The specific operation is as follows:

http://example.com/?curl_timeout=120&curl_connect_timeout=30

In the above URL, we added the curl_timeout and curl_connect_timeout parameters to the request parameters to set the timeout period of the curl request. curl automatically reads these parameters and applies their values ​​when making a request. This method is relatively simple, but there is a disadvantage: the parameters contained in the URL may be intercepted or modified by the browser or reverse proxy server.

Summary

We can set the timeout for curl requests in PHP by modifying the php.ini file or using the curl_setopt function or adding parameters to the URL. When using curl, you need to set the timeout reasonably according to the specific situation. Do not set the timeout too long to avoid affecting server performance.

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