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 PodsField_Website 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 PodsField_Website, and based on these observations, apply Extract Interface, too.
1 | <?php |
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5 | class PodsField_Website extends PodsField { |
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6 | |||
7 | /** |
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8 | * Field Type Group |
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9 | * |
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10 | * @var string |
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11 | * @since 2.0 |
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12 | */ |
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13 | public static $group = 'Text'; |
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14 | |||
15 | /** |
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16 | * Field Type Identifier |
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17 | * |
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18 | * @var string |
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19 | * @since 2.0 |
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20 | */ |
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21 | public static $type = 'website'; |
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22 | |||
23 | /** |
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24 | * Field Type Label |
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25 | * |
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26 | * @var string |
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27 | * @since 2.0 |
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28 | */ |
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29 | public static $label = 'Website'; |
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30 | |||
31 | /** |
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32 | * Field Type Preparation |
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33 | * |
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34 | * @var string |
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35 | * @since 2.0 |
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36 | */ |
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37 | public static $prepare = '%s'; |
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38 | |||
39 | /** |
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40 | * Do things like register/enqueue scripts and stylesheets |
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41 | * |
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42 | * @since 2.0 |
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43 | */ |
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44 | public function __construct () { |
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47 | |||
48 | /** |
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49 | * Add options and set defaults to |
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50 | * |
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51 | * @param array $options |
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52 | * |
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53 | * @since 2.0 |
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54 | */ |
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55 | public function options () { |
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108 | |||
109 | /** |
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110 | * Define the current field's schema for DB table storage |
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111 | * |
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112 | * @param array $options |
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113 | * |
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114 | * @return array |
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115 | * @since 2.0 |
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116 | */ |
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117 | View Code Duplication | public function schema ( $options = null ) { |
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127 | |||
128 | /** |
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129 | * Change the way the value of the field is displayed with Pods::get |
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130 | * |
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131 | * @param mixed $value |
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132 | * @param string $name |
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133 | * @param array $options |
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134 | * @param array $pod |
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135 | * @param int $id |
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136 | * |
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137 | * @return mixed|null |
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138 | * @since 2.0 |
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139 | */ |
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140 | public function display ( $value = null, $name = null, $options = null, $pod = null, $id = null ) { |
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158 | |||
159 | /** |
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160 | * Customize output of the form field |
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161 | * |
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162 | * @param string $name |
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163 | * @param mixed $value |
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164 | * @param array $options |
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165 | * @param array $pod |
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166 | * @param int $id |
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167 | * |
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168 | * @since 2.0 |
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169 | */ |
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170 | View Code Duplication | public function input ( $name, $value = null, $options = null, $pod = null, $id = null ) { |
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196 | |||
197 | /** |
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198 | * Validate a value before it's saved |
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199 | * |
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200 | * @param mixed $value |
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201 | * @param string $name |
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202 | * @param array $options |
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203 | * @param array $fields |
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204 | * @param array $pod |
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205 | * @param int $id |
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206 | * |
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207 | * @since 2.0 |
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208 | */ |
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209 | View Code Duplication | public function validate ( $value, $name = null, $options = null, $fields = null, $pod = null, $id = null, $params = null ) { |
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232 | |||
233 | /** |
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234 | * Change the value or perform actions after validation but before saving to the DB |
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235 | * |
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236 | * @param mixed $value |
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237 | * @param int $id |
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238 | * @param string $name |
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239 | * @param array $options |
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240 | * @param array $fields |
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241 | * @param array $pod |
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242 | * @param object $params |
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243 | * |
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244 | * @since 2.0 |
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245 | */ |
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246 | public function pre_save ( $value, $id = null, $name = null, $options = null, $fields = null, $pod = null, $params = null ) { |
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325 | |||
326 | /** |
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327 | * Customize the Pods UI manage table column output |
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328 | * |
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329 | * @param int $id |
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330 | * @param mixed $value |
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331 | * @param string $name |
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332 | * @param array $options |
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333 | * @param array $fields |
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334 | * @param array $pod |
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335 | * |
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336 | * @since 2.0 |
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337 | */ |
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338 | public function ui ( $id, $value, $name = null, $options = null, $fields = null, $pod = null ) { |
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343 | |||
344 | /** |
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345 | * Build an url |
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346 | * |
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347 | * @param array|string $url |
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348 | * |
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349 | * @return string |
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350 | */ |
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351 | public function build_url ( $url ) { |
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375 | } |
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376 |
This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function.
Consider the following example. The parameter
$italy
is not defined by the methodfinale(...)
.The most likely cause is that the parameter was removed, but the annotation was not.