Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like DNDeployment often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use DNDeployment, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 17 | class DNDeployment extends DataObject implements Finite\StatefulInterface, HasStateMachine { | 
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| 18 | |||
| 19 | const STATE_NEW = 'New';  | 
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| 20 | const STATE_SUBMITTED = 'Submitted';  | 
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| 21 | const STATE_INVALID = 'Invalid';  | 
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| 22 | const STATE_QUEUED = 'Queued';  | 
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| 23 | const STATE_DEPLOYING = 'Deploying';  | 
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| 24 | const STATE_ABORTING = 'Aborting';  | 
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| 25 | const STATE_COMPLETED = 'Completed';  | 
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| 26 | const STATE_FAILED = 'Failed';  | 
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| 27 | |||
| 28 | const TR_SUBMIT = 'submit';  | 
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| 29 | const TR_INVALIDATE = 'invalidate';  | 
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| 30 | const TR_QUEUE = 'queue';  | 
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| 31 | const TR_DEPLOY = 'deploy';  | 
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| 32 | const TR_ABORT = 'abort';  | 
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| 33 | const TR_COMPLETE = 'complete';  | 
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| 34 | const TR_FAIL = 'fail';  | 
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| 35 | |||
| 36 | /**  | 
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| 37 | * @var array  | 
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| 38 | */  | 
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| 39 | private static $db = array(  | 
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| 40 | "SHA" => "GitSHA",  | 
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| 41 | "ResqueToken" => "Varchar(255)",  | 
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| 42 | // The branch that was used to deploy this. Can't really be inferred from Git history because  | 
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| 43 | // the commit could appear in lots of branches that are irrelevant to the user when it comes  | 
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| 44 | // to deployment history, and the branch may have been deleted.  | 
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| 45 | "Branch" => "Varchar(255)",  | 
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| 46 | 		"State" => "Enum('New, Submitted, Invalid, Queued, Deploying, Aborting, Completed, Failed', 'New')", | 
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| 47 | // JSON serialised DeploymentStrategy.  | 
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| 48 | "Strategy" => "Text"  | 
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| 49 | );  | 
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| 50 | |||
| 51 | /**  | 
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| 52 | * @var array  | 
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| 53 | */  | 
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| 54 | private static $has_one = array(  | 
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| 55 | "Environment" => "DNEnvironment",  | 
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| 56 | "Deployer" => "Member",  | 
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| 57 | );  | 
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| 58 | |||
| 59 | private static $default_sort = '"LastEdited" DESC';  | 
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| 60 | |||
| 61 | 	public function getTitle() { | 
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| 64 | |||
| 65 | private static $summary_fields = array(  | 
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| 66 | 'LastEdited' => 'Last Edited',  | 
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| 67 | 'SHA' => 'SHA',  | 
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| 68 | 'State' => 'State',  | 
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| 69 | 'Deployer.Name' => 'Deployer'  | 
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| 70 | );  | 
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| 71 | |||
| 72 | 	public function getFiniteState() { | 
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| 75 | |||
| 76 |     public function setFiniteState($state) { | 
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| 80 | |||
| 81 | 	public function getStatus() { | 
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| 84 | |||
| 85 | 	public function getMachine() { | 
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| 139 | |||
| 140 | |||
| 141 | 	public function onQueue() { | 
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| 150 | |||
| 151 | 	public function onAbort() { | 
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| 155 | |||
| 156 | 	public function Link() { | 
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| 159 | |||
| 160 | 	public function LogLink() { | 
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| 163 | |||
| 164 | 	public function canView($member = null) { | 
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| 167 | |||
| 168 | /**  | 
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| 169 | * Return a path to the log file.  | 
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| 170 | * @return string  | 
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| 171 | */  | 
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| 172 | 	protected function logfile() { | 
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| 179 | |||
| 180 | /**  | 
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| 181 | * @return DeploynautLogFile  | 
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| 182 | */  | 
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| 183 | 	public function log() { | 
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| 186 | |||
| 187 | 	public function LogContent() { | 
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| 190 | |||
| 191 | /**  | 
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| 192 | * This remains here for backwards compatibility - we don't want to expose Resque status in here.  | 
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| 193 | * Resque job (DeployJob) will change statuses as part of its execution.  | 
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| 194 | *  | 
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| 195 | * @return string  | 
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| 196 | */  | 
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| 197 | 	public function ResqueStatus() { | 
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| 200 | |||
| 201 | |||
| 202 | /**  | 
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| 203 | * Fetch the git repository  | 
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| 204 | *  | 
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| 205 | * @return \Gitonomy\Git\Repository|null  | 
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| 206 | */  | 
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| 207 | 	public function getRepository() { | 
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| 213 | |||
| 214 | |||
| 215 | /**  | 
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| 216 | * Gets the commit from source. The result is cached upstream in Repository.  | 
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| 217 | *  | 
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| 218 | * @return \Gitonomy\Git\Commit|null  | 
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| 219 | */  | 
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| 220 | 	public function getCommit() { | 
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| 232 | |||
| 233 | |||
| 234 | /**  | 
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| 235 | * Gets the commit message.  | 
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| 236 | *  | 
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| 237 | * @return string|null  | 
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| 238 | */  | 
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| 239 | 	public function getCommitMessage() { | 
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| 250 | |||
| 251 | /**  | 
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| 252 | * Return all tags for the deployed commit.  | 
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| 253 | *  | 
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| 254 | * @return ArrayList  | 
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| 255 | */  | 
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| 256 | 	public function getTags() { | 
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| 271 | |||
| 272 | /**  | 
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| 273 | * Collate the list of additional flags to affix to this deployment.  | 
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| 274 | * Elements of the array will be rendered literally.  | 
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| 275 | *  | 
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| 276 | * @return ArrayList  | 
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| 277 | */  | 
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| 278 | 	public function getFullDeployMessages() { | 
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| 305 | |||
| 306 | /**  | 
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| 307 | * Fetches the latest tag for the deployed commit  | 
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| 308 | *  | 
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| 309 | * @return \Varchar|null  | 
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| 310 | */  | 
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| 311 | 	public function getTag() { | 
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| 318 | |||
| 319 | /**  | 
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| 320 | * @return DeploymentStrategy  | 
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| 321 | */  | 
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| 322 | 	public function getDeploymentStrategy() { | 
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| 328 | |||
| 329 | /**  | 
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| 330 | * Return a list of things that are going to be deployed, such  | 
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| 331 | * as the code version, and any infrastrucutral changes.  | 
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| 332 | *  | 
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| 333 | * @return ArrayList  | 
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| 334 | */  | 
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| 335 | 	public function getChanges() { | 
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| 361 | |||
| 362 | /**  | 
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| 363 | * Start a resque job for this deployment  | 
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| 364 | *  | 
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| 365 | * @return string Resque token  | 
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| 366 | */  | 
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| 367 | 	protected function enqueueDeployment() { | 
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| 406 | }  | 
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| 407 | 
Since your code implements the magic getter
_get, this function will be called for any read access on an undefined variable. You can add the@propertyannotation to your class or interface to document the existence of this variable.If the property has read access only, you can use the @property-read annotation instead.
Of course, you may also just have mistyped another name, in which case you should fix the error.
See also the PhpDoc documentation for @property.