How does PHP set the maximum page execution expiration time?

How does PHP set the maximum page execution expiration time?

Generally, when uploading a large attachment, a webpage will expire in 30 seconds. how can this problem be solved? The solution is as follows: 1. if it is your own server, you can configure it globally: set it in php. ini. the default value is 30 seconds. Max_execution_time = 30 2. the VM and the server can use the ini_set () function can be set in php code: Ini_set ('max _ execution_time ', 864000 ); // Set in php. ini, for example, 30 seconds Max_execution_time = 30 // Virtual host, and the server allows the ini_set () function, you can set in PHP code: Ini_set ('max _ execution_time ', 864000 );