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 |
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6 | class Http extends Request |
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7 | { |
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8 | const HTTP_X_REQUESTED_WITH = 'HTTP_X_REQUESTED_WITH'; |
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9 | const HTTP_X_REQUESTED_WITH_AJAX = 'XMLHttpRequest'; |
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10 | |||
11 | const REQUEST_URI = 'REQUEST_URI'; |
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12 | const REQUEST_SCHEME = 'REQUEST_SCHEME'; |
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13 | const QUERY_STRING = 'QUERY_STRING'; |
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14 | |||
15 | const REQUEST_METHOD = 'REQUEST_METHOD'; |
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16 | const REQUEST_METHOD_GET = 'GET'; |
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17 | const REQUEST_METHOD_POST = 'POST'; |
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18 | |||
19 | const SERVER_NAME = 'SERVER_NAME'; |
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20 | const HTTP_REFERER = 'HTTP_REFERER'; |
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21 | const HTTP_HOST = 'HTTP_HOST'; |
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22 | |||
23 | const AUTHORIZATION_TOKEN = 'Authorization-Token'; |
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24 | |||
25 | protected $get = array(); |
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26 | protected $post = array(); |
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27 | protected $server = array(); |
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28 | protected $files = array(); |
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29 | |||
30 | /** |
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31 | * mapped to HTTP values |
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32 | */ |
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33 | 27 | public function __construct() |
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40 | |||
41 | /** |
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42 | * Get a value in the request depending HTTP method |
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43 | * @param string $name Name to retrieve |
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44 | * @param mixed $defaultValue Value returned if name is not defined in query |
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45 | * @return mixed |
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46 | */ |
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47 | 1 | public function get($name, $defaultValue = null) |
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53 | |||
54 | /** |
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55 | * Check if param exists |
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56 | * @param string $name |
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57 | * @return bool |
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58 | */ |
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59 | 1 | public function has($name) |
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65 | |||
66 | /** |
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67 | * Return requested value in GET method |
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68 | * @param string $name Name to retrieve |
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69 | * @param mixed $defaultValue Value returned if name is not defined in query |
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70 | * @return mixed |
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71 | */ |
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72 | 2 | public function getGet($name, $defaultValue = null) |
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76 | |||
77 | /** |
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78 | * Return requested value in POST method |
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79 | * @param string $name Name to retrieve |
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80 | * @param mixed $defaultValue Value returned if name is not defined in query |
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81 | * @return mixed |
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82 | */ |
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83 | 2 | public function getPost($name, $defaultValue = null) |
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87 | |||
88 | /** |
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89 | * Retrieve a value defined on server |
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90 | * @param string $name Name to retrieve |
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91 | * @param mixed $defaultValue Value returned if name is not defined in query |
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92 | * @return mixed |
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93 | */ |
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94 | 7 | public function getServer($name, $defaultValue = null) |
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98 | |||
99 | /** |
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100 | * Retrieve a value defined on files |
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101 | * @param int $name |
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102 | * @param mixed $defaultValue Value returned if name is not defined in query |
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103 | * @return mixed |
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104 | */ |
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105 | 1 | public function getFiles($name, $defaultValue = null) |
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109 | |||
110 | /** |
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111 | * Check whether request is an Ajax request |
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112 | * @return bool |
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113 | */ |
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114 | 1 | public function isAjax() |
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119 | |||
120 | /** |
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121 | * Get HTTP method (GET/POST/DELETE...) |
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122 | * @return string |
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123 | */ |
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124 | 3 | public function getMethod() |
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128 | |||
129 | /** |
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130 | * Retrieve called URI |
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131 | * @param bool $withQuerySting must return query string in the request |
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132 | * @return string |
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133 | */ |
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134 | 1 | public function getRequestUri($withQuerySting = false) |
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143 | |||
144 | /** |
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145 | * Define a POST value |
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146 | * @param string $name Name to define |
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147 | * @param mixed $value Value to define |
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148 | * @return $this |
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149 | */ |
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150 | 1 | View Code Duplication | public function setPostValue($name, $value) |
158 | |||
159 | /** |
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160 | * Define a GET value |
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161 | * @param string $name Name to define |
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162 | * @param mixed $value Value to define |
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163 | * @return $this |
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164 | */ |
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165 | 1 | View Code Duplication | public function setGetValue($name, $value) |
173 | |||
174 | /** |
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175 | * Check whether selected post exists |
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176 | * @param string $name |
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177 | * @return bool |
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178 | */ |
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179 | 3 | public function hasPost($name) |
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183 | |||
184 | /** |
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185 | * Check whether selected get exists |
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186 | * @param string $name |
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187 | * @return bool |
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188 | */ |
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189 | 3 | public function hasGet($name) |
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193 | |||
194 | /** |
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195 | * Check whether selected server value exists |
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196 | * @param string $name |
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197 | * @return bool |
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198 | */ |
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199 | 7 | public function hasServer($name) |
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203 | |||
204 | /** |
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205 | * Check whether selected files value exists |
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206 | * @param string $name |
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207 | * @return bool |
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208 | */ |
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209 | 1 | public function hasFiles($name) |
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213 | |||
214 | /** |
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215 | * Return request referer |
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216 | * @return string |
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217 | */ |
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218 | 1 | public function getReferer() |
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222 | |||
223 | /** |
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224 | * Return request headers |
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225 | * @codeCoverageIgnore |
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226 | * @return array |
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227 | */ |
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228 | public function getHeaders() |
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232 | |||
233 | /** |
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234 | * Return requested key in headers HTTP |
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235 | * @param string $key |
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236 | * @param mixed $default |
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237 | * @return mixed |
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238 | */ |
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239 | 1 | public function getHeader($key, $default = null) |
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243 | |||
244 | /** |
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245 | * Check whether selected key exists |
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246 | * @param string $key |
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247 | * @return bool |
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248 | */ |
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249 | 2 | public function hasHeader($key) |
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253 | } |
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254 |
Instead of super-globals, we recommend to explicitly inject the dependencies of your class. This makes your code less dependent on global state and it becomes generally more testable: