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 |
||
3 | class WordAds_Params { |
||
4 | |||
5 | /** |
||
6 | * Setup parameters for serving the ads |
||
7 | * |
||
8 | * @since 4.5.0 |
||
9 | */ |
||
10 | public function __construct() { |
||
40 | |||
41 | /** |
||
42 | * @return boolean true if the user is browsing on a mobile device (iPad not included) |
||
43 | * |
||
44 | * @since 4.5.0 |
||
45 | */ |
||
46 | public function is_mobile() { |
||
49 | |||
50 | /** |
||
51 | * @return boolean true if site is being served via CloudFlare |
||
52 | * |
||
53 | * @since 4.5.0 |
||
54 | */ |
||
55 | public static function is_cloudflare() { |
||
71 | |||
72 | /** |
||
73 | * @return boolean true if user is browsing in iOS device |
||
74 | * |
||
75 | * @since 4.5.0 |
||
76 | */ |
||
77 | public function is_ios() { |
||
80 | |||
81 | /** |
||
82 | * Returns the user's device (see user-agent.php) or 'desktop' |
||
83 | * @return string user device |
||
84 | * |
||
85 | * @since 4.5.0 |
||
86 | */ |
||
87 | public function get_device() { |
||
100 | |||
101 | /** |
||
102 | * @return string The type of page that is being loaded |
||
103 | * |
||
104 | * @since 4.5.0 |
||
105 | */ |
||
106 | public function get_page_type() { |
||
131 | |||
132 | /** |
||
133 | * Returns true if page is static home |
||
134 | * @return boolean true if page is static home |
||
135 | * |
||
136 | * @since 4.5.0 |
||
137 | */ |
||
138 | public static function is_static_home() { |
||
143 | |||
144 | /** |
||
145 | * Logic for if we should show an ad |
||
146 | * |
||
147 | * @since 4.5.0 |
||
148 | */ |
||
149 | public static function should_show() { |
||
162 | |||
163 | /** |
||
164 | * Logic for if we should show a mobile ad |
||
165 | * |
||
166 | * @since 4.5.0 |
||
167 | */ |
||
168 | public static function should_show_mobile() { |
||
185 | } |
||
186 |
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: