How can PHP scripts handle errors related to the ssh2.sftp:// wrapper being disabled?

If the ssh2.sftp:// wrapper is disabled, PHP scripts can handle errors by checking if the wrapper is available before attempting to use it. This can be done using the function stream_wrapper_register() to register a custom wrapper that can handle the SFTP functionality if the ssh2 extension is not available. 

if (!in_array('ssh2', get_loaded_extensions())) {
    stream_wrapper_register('ssh2.sftp', 'CustomSFTPWrapper') or die('Failed to register protocol');
}

// Custom wrapper class to handle SFTP functionality if ssh2 extension is not available
class CustomSFTPWrapper {
    // Implement necessary methods for SFTP functionality
}

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