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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| 15 | class DNDeployment extends DataObject implements Finite\StatefulInterface, HasStateMachine { | 
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| 16 | |||
| 17 | const STATE_NEW = 'New';  | 
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| 18 | const STATE_SUBMITTED = 'Submitted';  | 
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| 19 | const STATE_INVALID = 'Invalid';  | 
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| 20 | const STATE_QUEUED = 'Queued';  | 
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| 21 | const STATE_DEPLOYING = 'Deploying';  | 
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| 22 | const STATE_ABORTING = 'Aborting';  | 
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| 23 | const STATE_COMPLETED = 'Completed';  | 
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| 24 | const STATE_FAILED = 'Failed';  | 
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| 25 | |||
| 26 | const TR_SUBMIT = 'submit';  | 
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| 27 | const TR_INVALIDATE = 'invalidate';  | 
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| 28 | const TR_QUEUE = 'queue';  | 
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| 29 | const TR_DEPLOY = 'deploy';  | 
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| 30 | const TR_ABORT = 'abort';  | 
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| 31 | const TR_COMPLETE = 'complete';  | 
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| 32 | const TR_FAIL = 'fail';  | 
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| 33 | |||
| 34 | /**  | 
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| 35 | * @var array  | 
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| 36 | */  | 
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| 37 | private static $db = array(  | 
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| 38 | "SHA" => "GitSHA",  | 
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| 39 | "ResqueToken" => "Varchar(255)",  | 
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| 40 | // The branch that was used to deploy this. Can't really be inferred from Git history because  | 
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| 41 | // the commit could appear in lots of branches that are irrelevant to the user when it comes  | 
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| 42 | // to deployment history, and the branch may have been deleted.  | 
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| 43 | "Branch" => "Varchar(255)",  | 
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| 44 | 		"State" => "Enum('New, Submitted, Invalid, Queued, Deploying, Aborting, Completed, Failed', 'New')", | 
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| 45 | // JSON serialised DeploymentStrategy.  | 
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| 46 | "Strategy" => "Text"  | 
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| 47 | );  | 
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| 48 | |||
| 49 | /**  | 
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| 50 | * @var array  | 
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| 51 | */  | 
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| 52 | private static $has_one = array(  | 
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| 53 | "Environment" => "DNEnvironment",  | 
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| 54 | "Deployer" => "Member",  | 
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| 55 | );  | 
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| 56 | |||
| 57 | private static $default_sort = '"LastEdited" DESC';  | 
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| 58 | |||
| 59 | private static $dependencies = [  | 
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| 60 | 'stateMachineFactory' => '%$StateMachineFactory'  | 
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| 61 | ];  | 
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| 62 | |||
| 63 | 	public function getTitle() { | 
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| 66 | |||
| 67 | private static $summary_fields = array(  | 
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| 68 | 'LastEdited' => 'Last Edited',  | 
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| 69 | 'SHA' => 'SHA',  | 
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| 70 | 'State' => 'State',  | 
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| 71 | 'Deployer.Name' => 'Deployer'  | 
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| 72 | );  | 
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| 73 | |||
| 74 | 	public function getFiniteState() { | 
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| 77 | |||
| 78 |     public function setFiniteState($state) { | 
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| 82 | |||
| 83 | 	public function getStatus() { | 
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| 86 | |||
| 87 | 	public function getMachine() { | 
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| 90 | |||
| 91 | 	public function Link() { | 
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| 94 | |||
| 95 | 	public function LogLink() { | 
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| 98 | |||
| 99 | 	public function canView($member = null) { | 
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| 102 | |||
| 103 | /**  | 
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| 104 | * Return a path to the log file.  | 
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| 105 | * @return string  | 
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| 106 | */  | 
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| 107 | 	protected function logfile() { | 
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| 114 | |||
| 115 | /**  | 
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| 116 | * @return DeploynautLogFile  | 
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| 117 | */  | 
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| 118 | 	public function log() { | 
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| 121 | |||
| 122 | 	public function LogContent() { | 
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| 125 | |||
| 126 | /**  | 
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| 127 | * This remains here for backwards compatibility - we don't want to expose Resque status in here.  | 
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| 128 | * Resque job (DeployJob) will change statuses as part of its execution.  | 
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| 129 | *  | 
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| 130 | * @return string  | 
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| 131 | */  | 
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| 132 | 	public function ResqueStatus() { | 
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| 135 | |||
| 136 | |||
| 137 | /**  | 
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| 138 | * Fetch the git repository  | 
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| 139 | *  | 
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| 140 | * @return \Gitonomy\Git\Repository|null  | 
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| 141 | */  | 
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| 142 | 	public function getRepository() { | 
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| 148 | |||
| 149 | |||
| 150 | /**  | 
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| 151 | * Gets the commit from source. The result is cached upstream in Repository.  | 
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| 152 | *  | 
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| 153 | * @return \Gitonomy\Git\Commit|null  | 
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| 154 | */  | 
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| 155 | 	public function getCommit() { | 
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| 167 | |||
| 168 | |||
| 169 | /**  | 
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| 170 | * Gets the commit message.  | 
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| 171 | *  | 
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| 172 | * @return string|null  | 
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| 173 | */  | 
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| 174 | 	public function getCommitMessage() { | 
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| 185 | |||
| 186 | /**  | 
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| 187 | * Return all tags for the deployed commit.  | 
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| 188 | *  | 
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| 189 | * @return ArrayList  | 
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| 190 | */  | 
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| 191 | 	public function getTags() { | 
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| 206 | |||
| 207 | /**  | 
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| 208 | * Collate the list of additional flags to affix to this deployment.  | 
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| 209 | * Elements of the array will be rendered literally.  | 
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| 210 | *  | 
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| 211 | * @return ArrayList  | 
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| 212 | */  | 
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| 213 | 	public function getFullDeployMessages() { | 
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| 240 | |||
| 241 | /**  | 
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| 242 | * Fetches the latest tag for the deployed commit  | 
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| 243 | *  | 
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| 244 | * @return \Varchar|null  | 
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| 245 | */  | 
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| 246 | 	public function getTag() { | 
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| 253 | |||
| 254 | /**  | 
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| 255 | * @return DeploymentStrategy  | 
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| 256 | */  | 
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| 257 | 	public function getDeploymentStrategy() { | 
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| 263 | |||
| 264 | /**  | 
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| 265 | * Return a list of things that are going to be deployed, such  | 
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| 266 | * as the code version, and any infrastrucutral changes.  | 
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| 267 | *  | 
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| 268 | * @return ArrayList  | 
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| 269 | */  | 
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| 270 | 	public function getChanges() { | 
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| 296 | |||
| 297 | /**  | 
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| 298 | * Start a resque job for this deployment  | 
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| 299 | *  | 
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| 300 | * @return string Resque token  | 
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| 301 | */  | 
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| 302 | 	public function enqueueDeployment() { | 
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| 341 | }  | 
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| 342 | 
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.