Complex classes like WordAds_Params 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 WordAds_Params, and based on these observations, apply Extract Interface, too.
1 | <?php |
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3 | class WordAds_Params { |
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4 | |||
5 | /** |
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6 | * Setup parameters for serving the ads |
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7 | * |
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8 | * @since 4.5.0 |
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9 | */ |
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10 | public function __construct() { |
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58 | |||
59 | /** |
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60 | * @return boolean true if the user is browsing on a mobile device (iPad not included) |
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61 | * |
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62 | * @since 4.5.0 |
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63 | */ |
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64 | public function is_mobile() { |
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67 | |||
68 | /** |
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69 | * @return boolean true if site is being served via CloudFlare |
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70 | * |
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71 | * @since 4.5.0 |
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72 | */ |
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73 | public static function is_cloudflare() { |
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89 | |||
90 | /** |
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91 | * @return boolean true if user is browsing in iOS device |
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92 | * |
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93 | * @since 4.5.0 |
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94 | */ |
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95 | public function is_ios() { |
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98 | |||
99 | /** |
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100 | * Returns the user's device (see user-agent.php) or 'desktop' |
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101 | * @return string user device |
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102 | * |
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103 | * @since 4.5.0 |
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104 | */ |
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105 | public function get_device() { |
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118 | |||
119 | /** |
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120 | * @return string The type of page that is being loaded |
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121 | * |
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122 | * @since 4.5.0 |
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123 | */ |
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124 | public function get_page_type() { |
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149 | |||
150 | /** |
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151 | * @return int The page type code for ipw config |
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152 | * |
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153 | * @since 5.6.0 |
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154 | */ |
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155 | public function get_page_type_ipw() { |
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178 | |||
179 | /** |
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180 | * Returns true if page is static home |
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181 | * @return boolean true if page is static home |
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182 | * |
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183 | * @since 4.5.0 |
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184 | */ |
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185 | public static function is_static_home() { |
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190 | |||
191 | /** |
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192 | * Logic for if we should show an ad |
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193 | * |
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194 | * @since 4.5.0 |
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195 | */ |
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196 | public function should_show() { |
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225 | } |
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226 |
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: