What potential issues can arise when using the PHP copy() function to transfer files between servers?

When using the PHP copy() function to transfer files between servers, potential issues can arise due to file permissions and server configurations. To solve this, you can use the PHP FTP functions to transfer files securely between servers. 

// Connect to the FTP server
$ftp_server = 'ftp.example.com';
$ftp_username = 'username';
$ftp_password = 'password';
$conn_id = ftp_connect($ftp_server);
$login_result = ftp_login($conn_id, $ftp_username, $ftp_password);

// Transfer file from local server to remote server
$local_file = 'localfile.txt';
$remote_file = 'remotefile.txt';
if (ftp_put($conn_id, $remote_file, $local_file, FTP_BINARY)) {
    echo "File transfer successful";
} else {
    echo "File transfer failed";
}

// Close the FTP connection
ftp_close($conn_id);

Keywords

copy() PHP file transfer servers potential issues

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