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:
| 1 | <?php | ||
| 14 | class UserDefinedForm_EmailRecipientCondition extends DataObject | ||
|  | |||
| 15 | { | ||
| 16 | |||
| 17 | /** | ||
| 18 | * List of options | ||
| 19 | * | ||
| 20 | * @config | ||
| 21 | * @var array | ||
| 22 | */ | ||
| 23 | private static $condition_options = array( | ||
| 24 | "IsBlank" => "Is blank", | ||
| 25 | "IsNotBlank" => "Is not blank", | ||
| 26 | "Equals" => "Equals", | ||
| 27 | "NotEquals" => "Doesn't equal", | ||
| 28 | "ValueLessThan" => "Less than", | ||
| 29 | "ValueLessThanEqual" => "Less than or equal", | ||
| 30 | "ValueGreaterThan" => "Greater than", | ||
| 31 | "ValueGreaterThanEqual" => "Greater than or equal" | ||
| 32 | ); | ||
| 33 | |||
| 34 | private static $db = array( | ||
| 35 |         'ConditionOption' => 'Enum("IsBlank,IsNotBlank,Equals,NotEquals,ValueLessThan,ValueLessThanEqual,ValueGreaterThan,ValueGreaterThanEqual")', | ||
| 36 | 'ConditionValue' => 'Varchar' | ||
| 37 | ); | ||
| 38 | |||
| 39 | private static $has_one = array( | ||
| 40 | 'Parent' => 'UserDefinedForm_EmailRecipient', | ||
| 41 | 'ConditionField' => 'EditableFormField' | ||
| 42 | 1 | ); | |
| 43 | |||
| 44 | 1 | /** | |
| 45 | 1 | * | |
| 46 | 1 | * Determine if this rule matches the given condition | |
| 47 | 1 | * | |
| 48 | 1 | * @param $data | |
| 49 | 1 | * | |
| 50 | 1 | * @return bool|null | |
| 51 | 1 | * @throws LogicException | |
| 52 | 1 | */ | |
| 53 | 1 | public function matches($data) | |
| 95 | |||
| 96 | /** | ||
| 97 | * Return whether a user can create an object of this type | ||
| 98 | * | ||
| 99 | * @param Member $member | ||
| 100 | * @param array $context Virtual parameter to allow context to be passed in to check | ||
| 101 | * @return bool | ||
| 102 | */ | ||
| 103 | View Code Duplication | public function canCreate($member = null) | |
| 114 | |||
| 115 | /** | ||
| 116 | * Helper method to check the parent for this object | ||
| 117 | * | ||
| 118 | * @param array $args List of arguments passed to canCreate | ||
| 119 | * @return SiteTree Parent page instance | ||
| 120 | */ | ||
| 121 | View Code Duplication | protected function getCanCreateContext($args) | |
| 135 | |||
| 136 | /** | ||
| 137 | * @param Member | ||
| 138 | * | ||
| 139 | * @return boolean | ||
| 140 | */ | ||
| 141 | public function canView($member = null) | ||
| 145 | |||
| 146 | /** | ||
| 147 | * @param Member | ||
| 148 | * | ||
| 149 | * @return boolean | ||
| 150 | */ | ||
| 151 | public function canEdit($member = null) | ||
| 155 | |||
| 156 | /** | ||
| 157 | * @param Member | ||
| 158 | * | ||
| 159 | * @return boolean | ||
| 160 | */ | ||
| 161 | public function canDelete($member = null) | ||
| 165 | } | ||
| 166 | 
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.