How can PHP developers ensure compatibility with older FTPS implementations?

To ensure compatibility with older FTPS implementations, PHP developers can specify the FTPS protocol version to use when establishing the connection. This can be done by setting the "ftp_ssl" context option to "SSLv3" or "TLSv1" depending on the specific requirements of the FTP server. 

// Specify the FTPS protocol version to use
$ftp_context = stream_context_create([
    'ssl' => [
        'crypto_method' => STREAM_CRYPTO_METHOD_SSLv3_CLIENT
    ]
]);

// Connect to the FTP server using the specified context
$ftp_connection = ftp_ssl_connect('ftp.example.com', 21, -1, $ftp_context);

Keywords

PHP FTPS compatibility older implementations functions

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