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Example of php detecting whether a remote file exists

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$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';
}

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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.

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