Example of php detecting whether a remote file exists

 $url = 'http://xxxx.com';
 $hander_array = get_headers ( $url );
 if ($header_array [0] == 'HTTP/1.1 200 OK' ) {
 echo 'The file exists';
 } else {
 echo 'The file does not exist';
 }

Instructions: get_headers accesses a remote address and returns the HTTP headers sent by the server in the form of an array. And $header[0] is the status code returned by the server (if nothing else happens, the status code should be the first one returned).

To confirm that a file exists on the remote server, just make sure that the status code returned by accessing the file is "HTTP/1.1 200 OK" (Can the status code HTTP/1.1 404 Not Found detect that a file does not exist? Leave it to the readers to think).

For an example of obtaining a three-digit HTTP response code, please refer to the article PHP code to detect whether a remote file exists.