$cmdlength
$cmdlength : integer
Allowable command length (in octets).
Query the capabilities of an IMAP server.
query(string $capability, string $parameter = null) : boolean
Returns whether the server supports the given capability.
| string | $capability | The capability string to query. | 
| string | $parameter | If set, require the parameter to exist. | 
True if the capability (and parameter) exist.
isEnabled(string  $capability = null) : mixed
                Is the extension enabled?
| string | $capability | The extension (+ parameter) to query. If null, returns all enabled extensions. | 
If $capability is null, return all enabled extensions. Otherwise, true if the extension (+ parameter) is enabled.
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| None found | 
notify()
Notification is triggered internally whenever the object's internal data storage is altered.
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