Complex classes like Str 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 Str, and based on these observations, apply Extract Interface, too.
1 | <?php |
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9 | class Str { |
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10 | /** |
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11 | * The cache of snake-cased words. |
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12 | * |
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13 | * @var array |
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14 | */ |
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15 | protected static $snakeCache = []; |
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16 | /** |
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17 | * The cache of camel-cased words. |
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18 | * |
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19 | * @var array |
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20 | */ |
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21 | protected static $camelCache = []; |
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22 | /** |
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23 | * The cache of studly-cased words. |
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24 | * |
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25 | * @var array |
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26 | */ |
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27 | protected static $studlyCache = []; |
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28 | |||
29 | /** |
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30 | * 判断一个字符串是否以给定字符串开始 |
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31 | * |
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32 | * @param string $haystack |
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33 | * @param string|array $needles |
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34 | * @return bool |
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35 | */ |
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36 | 3 | public static function startsWith($haystack, $needles) |
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45 | |||
46 | /** |
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47 | * 判断一个字符串是否以给定字符串结尾 |
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48 | * |
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49 | * @param string $haystack |
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50 | * @param string|array $needles |
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51 | * @return bool |
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52 | */ |
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53 | 1 | public static function endsWith($haystack, $needles) |
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62 | |||
63 | /** |
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64 | * Convert a value to camel case. |
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65 | * |
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66 | * @param string $value |
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67 | * @return string |
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68 | */ |
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69 | public static function camel($value) { |
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76 | |||
77 | /** |
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78 | * Convert a value to studly caps case. |
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79 | * |
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80 | * @param string $value |
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81 | * @return string |
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82 | */ |
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83 | 1 | public static function studly($value) { |
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94 | |||
95 | /** |
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96 | * Cap a string with a single instance of a given value. |
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97 | * |
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98 | * @param string $value |
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99 | * @param string $cap |
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100 | * @return string |
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101 | */ |
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102 | public static function finish($value, $cap) { |
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107 | |||
108 | /** |
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109 | * Determine if a given string matches a given pattern. |
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110 | * |
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111 | * @param string $pattern |
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112 | * @param string $value |
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113 | * @return bool |
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114 | */ |
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115 | public static function is($pattern, $value) { |
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129 | |||
130 | /** |
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131 | * Convert a string to kebab case. |
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132 | * |
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133 | * @param string $value |
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134 | * @return string |
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135 | */ |
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136 | public static function kebab($value) { |
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139 | |||
140 | /** |
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141 | * Convert a string to snake case. |
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142 | * |
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143 | * @param string $value |
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144 | * @param string $delimiter |
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145 | * @return string |
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146 | */ |
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147 | public static function snake($value, $delimiter = '_') { |
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162 | |||
163 | /** |
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164 | * Convert the given string to lower-case. |
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165 | * |
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166 | * @param string $value |
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167 | * @return string |
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168 | */ |
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169 | public static function lower($value) { |
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172 | |||
173 | /** |
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174 | * Limit the number of characters in a string. |
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175 | * |
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176 | * @param string $value |
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177 | * @param int $limit |
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178 | * @param string $end |
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179 | * @return string |
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180 | */ |
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181 | public static function limit($value, $limit = 100, $end = '...') { |
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188 | |||
189 | /** |
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190 | * Limit the number of words in a string. |
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191 | * |
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192 | * @param string $value |
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193 | * @param int $words |
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194 | * @param string $end |
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195 | * @return string |
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196 | */ |
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197 | public static function words($value, $words = 100, $end = '...') { |
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206 | |||
207 | /** |
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208 | * Return the length of the given string. |
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209 | * |
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210 | * @param string $value |
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211 | * @return int |
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212 | */ |
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213 | public static function length($value) { |
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216 | |||
217 | /** |
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218 | * Parse a Class@method style callback into class and method. |
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219 | * |
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220 | * @param string $callback |
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221 | * @param string|null $default |
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222 | * @return array |
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223 | */ |
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224 | public static function parseCallback($callback, $default = null) { |
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227 | |||
228 | /** |
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229 | * 判断一个字符串是否包含于另一个字符中 |
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230 | * |
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231 | * @param string $haystack |
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232 | * @param string|array $needles |
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233 | * @return bool |
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234 | */ |
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235 | 1 | public static function contains($haystack, $needles) { |
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243 | |||
244 | /** |
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245 | * Get the plural form of an English word. |
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246 | * |
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247 | * @param string $value |
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248 | * @param int $count |
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249 | * @return string |
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250 | */ |
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251 | public static function plural($value, $count = 2) { |
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254 | |||
255 | /** |
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256 | * Generate a "random" alpha-numeric string. |
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257 | * |
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258 | * Should not be considered sufficient for cryptography, etc. |
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259 | * |
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260 | * @deprecated since version 5.3. Use the "random" method directly. |
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261 | * |
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262 | * @param int $length |
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263 | * @return string |
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264 | */ |
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265 | public static function quickRandom($length = 16) { |
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274 | |||
275 | /** |
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276 | * Generate a more truly "random" alpha-numeric string. |
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277 | * |
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278 | * @param int $length |
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279 | * @return string |
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280 | */ |
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281 | public static function random($length = 16) { |
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294 | |||
295 | /** |
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296 | * Replace a given value in the string sequentially with an array. |
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297 | * |
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298 | * @param string $search |
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299 | * @param array $replace |
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300 | * @param string $subject |
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301 | * @return string |
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302 | */ |
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303 | public static function replaceArray($search, array $replace, $subject) { |
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310 | |||
311 | /** |
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312 | * Replace the first occurrence of a given value in the string. |
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313 | * |
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314 | * @param string $search |
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315 | * @param string $replace |
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316 | * @param string $subject |
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317 | * @return string |
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318 | */ |
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319 | public static function replaceFirst($search, $replace, $subject) { |
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328 | |||
329 | /** |
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330 | * Replace the last occurrence of a given value in the string. |
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331 | * |
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332 | * @param string $search |
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333 | * @param string $replace |
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334 | * @param string $subject |
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335 | * @return string |
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336 | */ |
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337 | public static function replaceLast($search, $replace, $subject) { |
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346 | |||
347 | /** |
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348 | * Convert the given string to title case. |
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349 | * |
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350 | * @param string $value |
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351 | * @return string |
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352 | */ |
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353 | public static function title($value) { |
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356 | |||
357 | /** |
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358 | * Get the singular form of an English word. |
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359 | * |
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360 | * @param string $value |
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361 | * @return string |
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362 | */ |
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363 | public static function singular($value) { |
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366 | |||
367 | /** |
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368 | * Generate a URL friendly "slug" from a given string. |
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369 | * |
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370 | * @param string $title |
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371 | * @param string $separator |
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372 | * @return string |
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373 | */ |
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374 | public static function slug($title, $separator = '-') { |
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390 | |||
391 | /** |
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392 | * Transliterate a UTF-8 value to ASCII. |
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393 | * |
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394 | * @param string $value |
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395 | * @return string |
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396 | */ |
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397 | public static function ascii($value) { |
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404 | |||
405 | /** |
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406 | * Returns the replacements for the ascii method. |
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407 | * |
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408 | * Note: Adapted from Stringy\Stringy. |
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409 | * |
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410 | * @see https://github.com/danielstjules/Stringy/blob/2.3.1/LICENSE.txt |
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411 | * |
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412 | * @return array |
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413 | */ |
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414 | protected static function charsArray() { |
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537 | |||
538 | /** |
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539 | * Make a string's first character uppercase. |
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540 | * |
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541 | * @param string $string |
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542 | * @return string |
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543 | */ |
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544 | public static function ucfirst($string) { |
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547 | |||
548 | /** |
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549 | * Convert the given string to upper-case. |
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550 | * |
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551 | * @param string $value |
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552 | * @return string |
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553 | */ |
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554 | public static function upper($value) { |
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557 | |||
558 | /** |
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559 | * Returns the portion of string specified by the start and length parameters. |
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560 | * |
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561 | * @param string $string |
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562 | * @param int $start |
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563 | * @param int|null $length |
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564 | * @return string |
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565 | */ |
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566 | public static function substr($string, $start, $length = null) { |
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569 | } |