What potential issues should be considered when checking for the existence of a file on a different server in PHP?

When checking for the existence of a file on a different server in PHP, potential issues to consider include network latency, server availability, and access permissions. It's important to handle potential errors gracefully, such as connection timeouts or permission denied errors. Additionally, ensure that the server you are checking has the necessary file permissions set up for the file you are trying to access. 

$server_url = 'http://example.com/file.txt';
$file_headers = @get_headers($server_url);

if($file_headers[0] == 'HTTP/1.1 200 OK') {
    echo "File exists on the server.";
} else {
    echo "File does not exist on the server.";
}

Keywords

file_exists fopen allow_url_fopen cURL error handling

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