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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18 | class TelegramLog |
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19 | { |
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20 | /** |
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21 | * Monolog instance |
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22 | * |
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23 | * @var \Monolog\Logger |
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24 | */ |
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25 | static protected $monolog = null; |
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26 | |||
27 | /** |
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28 | * Monolog instance for update |
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29 | * |
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30 | * @var \Monolog\Logger |
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31 | */ |
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32 | static protected $monolog_update = null; |
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33 | |||
34 | /** |
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35 | * Path for error log |
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36 | * |
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37 | * @var string |
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38 | */ |
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39 | static protected $error_log_path = null; |
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40 | |||
41 | /** |
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42 | * Path for debug log |
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43 | * |
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44 | * @var string |
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45 | */ |
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46 | static protected $debug_log_path = null; |
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47 | |||
48 | /** |
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49 | * Path for update log |
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50 | * |
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51 | * @var string |
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52 | */ |
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53 | static protected $update_log_path = null; |
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54 | |||
55 | /** |
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56 | * Temporary stream handle for debug log |
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57 | * |
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58 | * @var null |
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59 | */ |
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60 | static protected $debug_log_temp_stream_handle = null; |
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61 | |||
62 | /** |
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63 | * Initialize |
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64 | * |
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65 | * Initilize monolog instance. Singleton |
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66 | * Is possbile provide an external monolog instance |
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67 | * |
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68 | * @param \Monolog\Logger |
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69 | * |
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70 | * @return \Monolog\Logger |
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71 | */ |
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72 | 3 | public static function initialize(Logger $external_monolog = null) |
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73 | { |
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74 | 3 | if (self::$monolog === null) { |
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75 | 3 | if ($external_monolog !== null) { |
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76 | 1 | self::$monolog = $external_monolog; |
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77 | |||
78 | 1 | foreach (self::$monolog->getHandlers() as $handler) { |
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79 | 1 | if ($handler->getLevel() == 400) { |
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80 | 1 | self::$error_log_path = true; |
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81 | } |
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82 | 1 | if ($handler->getLevel() == 100) { |
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83 | 1 | self::$debug_log_path = true; |
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84 | } |
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85 | } |
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86 | } else { |
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87 | 2 | self::$monolog = new Logger('bot_log'); |
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88 | } |
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89 | } |
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90 | 3 | return self::$monolog; |
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91 | } |
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92 | |||
93 | /** |
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94 | * Initialize error log |
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95 | * |
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96 | * @param string $path |
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97 | * |
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98 | * @return \Monolog\Logger |
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99 | * @throws \Longman\TelegramBot\Exception\TelegramLogException |
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100 | */ |
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101 | 2 | View Code Duplication | public static function initErrorLog($path) |
102 | { |
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103 | 2 | if ($path === null || $path === '') { |
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104 | 1 | throw new TelegramLogException('Empty path for error log'); |
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105 | } |
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106 | 1 | self::initialize(); |
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107 | 1 | self::$error_log_path = $path; |
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108 | |||
109 | 1 | return self::$monolog->pushHandler( |
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110 | 1 | (new StreamHandler(self::$error_log_path, Logger::ERROR)) |
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111 | 1 | ->setFormatter(new LineFormatter(null, null, true)) |
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112 | ); |
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113 | } |
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114 | |||
115 | /** |
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116 | * Initialize debug log |
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117 | * |
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118 | * @param string $path |
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119 | * |
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120 | * @return \Monolog\Logger |
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121 | * @throws \Longman\TelegramBot\Exception\TelegramLogException |
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122 | */ |
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123 | 2 | View Code Duplication | public static function initDebugLog($path) |
124 | { |
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125 | 2 | if ($path === null || $path === '') { |
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126 | 1 | throw new TelegramLogException('Empty path for debug log'); |
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127 | } |
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128 | 1 | self::initialize(); |
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129 | 1 | self::$debug_log_path = $path; |
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130 | |||
131 | 1 | return self::$monolog->pushHandler( |
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132 | 1 | (new StreamHandler(self::$debug_log_path, Logger::DEBUG)) |
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133 | 1 | ->setFormatter(new LineFormatter(null, null, true)) |
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134 | ); |
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135 | } |
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136 | |||
137 | /** |
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138 | * Get the stream handle of the temporary debug output |
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139 | * |
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140 | * @return mixed The stream if debug is active, else false |
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141 | */ |
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142 | public static function getDebugLogTempStream() |
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143 | { |
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144 | if (self::$debug_log_temp_stream_handle === null) { |
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145 | if (self::isDebugLogActive()) { |
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146 | self::$debug_log_temp_stream_handle = fopen('php://temp', 'w+'); |
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147 | } else { |
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148 | return false; |
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149 | } |
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150 | } |
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151 | return self::$debug_log_temp_stream_handle; |
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152 | } |
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153 | |||
154 | /** |
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155 | * Write the temporary debug stream to log and close the stream handle |
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156 | * |
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157 | * @param string $message Message (with placeholder) to write to the debug log |
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158 | */ |
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159 | public static function endDebugLogTempStream($message = '%s') |
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160 | { |
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161 | if (self::$debug_log_temp_stream_handle !== null) { |
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162 | rewind(self::$debug_log_temp_stream_handle); |
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163 | self::debug( |
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164 | sprintf( |
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165 | $message, |
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166 | stream_get_contents(self::$debug_log_temp_stream_handle) |
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167 | ) |
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168 | ); |
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169 | fclose(self::$debug_log_temp_stream_handle); |
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170 | self::$debug_log_temp_stream_handle = null; |
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171 | } |
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172 | } |
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173 | |||
174 | /** |
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175 | * Initialize update log |
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176 | * |
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177 | * Initilize monolog instance. Singleton |
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178 | * Is possbile provide an external monolog instance |
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179 | * |
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180 | * @param string $path |
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181 | * |
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182 | * @return \Monolog\Logger |
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183 | * @throws \Longman\TelegramBot\Exception\TelegramLogException |
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184 | */ |
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185 | 2 | public static function initUpdateLog($path) |
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186 | { |
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187 | 2 | if ($path === null || $path === '') { |
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188 | 1 | throw new TelegramLogException('Empty path for update log'); |
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189 | } |
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190 | 1 | self::$update_log_path = $path; |
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191 | 1 | if (self::$monolog_update === null) { |
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192 | 1 | self::$monolog_update = new Logger('bot_update_log'); |
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193 | // Create a formatter |
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194 | 1 | $output = "%message%\n"; |
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195 | 1 | $formatter = new LineFormatter($output); |
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196 | |||
197 | // Update handler |
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198 | 1 | $update_handler = new StreamHandler(self::$update_log_path, Logger::INFO); |
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199 | 1 | $update_handler->setFormatter($formatter); |
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200 | |||
201 | 1 | self::$monolog_update->pushHandler($update_handler); |
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202 | } |
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203 | 1 | return self::$monolog; |
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204 | } |
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205 | |||
206 | /** |
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207 | * Is error log active |
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208 | * |
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209 | * @return bool |
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210 | */ |
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211 | 4 | public static function isErrorLogActive() |
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215 | |||
216 | /** |
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217 | * Is debug log active |
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218 | * |
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219 | * @return bool |
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220 | */ |
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221 | 2 | public static function isDebugLogActive() |
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225 | |||
226 | /** |
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227 | * Is update log active |
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228 | * |
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229 | * @return bool |
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230 | */ |
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231 | 1 | public static function isUpdateLogActive() |
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235 | |||
236 | /** |
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237 | * Report error log |
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238 | * |
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239 | * @param string $text |
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240 | */ |
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241 | 4 | public static function error($text) |
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247 | |||
248 | /** |
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249 | * Report debug log |
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250 | * |
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251 | * @param string $text |
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252 | */ |
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253 | 2 | public static function debug($text) |
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259 | |||
260 | /** |
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261 | * Report update log |
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262 | * |
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263 | * @param string $text |
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264 | */ |
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265 | 1 | public static function update($text) |
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271 | } |
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272 |
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: