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:
Complex classes like Cron 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 Cron, and based on these observations, apply Extract Interface, too.
1 | <?php |
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8 | class Cron |
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9 | { |
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10 | /** |
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11 | * Weekday look-up table |
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12 | * |
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13 | * @var array |
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14 | */ |
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15 | protected static $weekdays = [ |
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16 | 'sun' => 0, |
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17 | 'mon' => 1, |
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18 | 'tue' => 2, |
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19 | 'wed' => 3, |
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20 | 'thu' => 4, |
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21 | 'fri' => 5, |
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22 | 'sat' => 6 |
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23 | ]; |
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24 | |||
25 | /** |
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26 | * Month name look-up table |
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27 | * |
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28 | * @var array |
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29 | */ |
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30 | protected static $months = [ |
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31 | 'jan' => 1, |
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32 | 'feb' => 2, |
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33 | 'mar' => 3, |
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34 | 'apr' => 4, |
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35 | 'may' => 5, |
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36 | 'jun' => 6, |
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37 | 'jul' => 7, |
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38 | 'aug' => 8, |
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39 | 'sep' => 9, |
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40 | 'oct' => 10, |
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41 | 'nov' => 11, |
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42 | 'dec' => 12 |
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43 | ]; |
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44 | |||
45 | /** |
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46 | * Value boundaries |
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47 | * |
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48 | * @var array |
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49 | */ |
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50 | protected static $boundaries = [ |
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51 | 0 => [ |
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52 | 'min' => 0, |
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53 | 'max' => 59 |
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54 | ], |
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55 | 1 => [ |
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56 | 'min' => 0, |
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57 | 'max' => 23 |
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58 | ], |
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59 | 2 => [ |
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60 | 'min' => 1, |
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61 | 'max' => 31 |
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62 | ], |
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63 | 3 => [ |
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64 | 'min' => 1, |
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65 | 'max' => 12 |
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66 | ], |
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67 | 4 => [ |
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68 | 'min' => 0, |
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69 | 'max' => 7 |
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70 | ] |
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71 | ]; |
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72 | |||
73 | /** |
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74 | * Cron expression |
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75 | * |
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76 | * @var string |
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77 | */ |
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78 | protected $expression; |
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79 | |||
80 | /** |
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81 | * Time zone |
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82 | * |
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83 | * @var \DateTimeZone |
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84 | */ |
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85 | protected $timeZone; |
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86 | |||
87 | /** |
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88 | * Matching register |
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89 | * |
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90 | * @var array|null |
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91 | */ |
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92 | protected $register; |
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93 | |||
94 | /** |
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95 | * Class constructor sets cron expression property |
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96 | * |
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97 | * @param string $expression cron expression |
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98 | * @param \DateTimeZone $timeZone |
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99 | */ |
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100 | public function __construct($expression = '* * * * *', \DateTimeZone $timeZone = null) |
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105 | |||
106 | /** |
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107 | * Set expression |
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108 | * |
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109 | * @param string $expression |
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110 | * @return self |
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111 | */ |
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112 | public function setExpression($expression) |
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119 | |||
120 | /** |
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121 | * Set time zone |
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122 | * |
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123 | * @param \DateTimeZone $timeZone |
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124 | * @return self |
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125 | */ |
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126 | public function setTimeZone(\DateTimeZone $timeZone = null) |
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131 | |||
132 | /** |
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133 | * Calculate next matching timestamp |
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134 | * |
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135 | * @param mixed $dtime \DateTime object, timestamp or null |
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136 | * @return int|bool next matching timestamp, or false on error |
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137 | */ |
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138 | public function getNext($dtime = null) |
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165 | |||
166 | /** |
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167 | * @param \DateTime $dtime |
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168 | * @param array $pointer |
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169 | * @return array |
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170 | */ |
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171 | private function adjust(\DateTime $dtime, array &$pointer) |
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193 | |||
194 | /** |
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195 | * @param \DateTime $dtime |
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196 | * @param array $current |
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197 | * @return bool |
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198 | */ |
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199 | private function forward(\DateTime $dtime, array $current) |
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219 | |||
220 | /** |
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221 | * Parse and validate cron expression |
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222 | * |
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223 | * @return bool true if expression is valid, or false on error |
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224 | */ |
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225 | public function isValid() |
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239 | |||
240 | /** |
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241 | * Match current or given date/time against cron expression |
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242 | * |
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243 | * @param mixed $dtime \DateTime object, timestamp or null |
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244 | * @return bool |
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245 | */ |
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246 | public function isMatching($dtime = null) |
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265 | |||
266 | /** |
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267 | * @param array $segments |
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268 | * @return bool |
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269 | * @throws \Exception |
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270 | */ |
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271 | private function match(array $segments) |
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284 | |||
285 | /** |
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286 | * Parse whole cron expression |
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287 | * |
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288 | * @return array |
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289 | * @throws \Exception |
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290 | */ |
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291 | private function parse() |
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309 | |||
310 | /** |
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311 | * Parse one segment of a cron expression |
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312 | * |
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313 | * @param int $index |
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314 | * @param string $segment |
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315 | * @param array $register |
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316 | * @throws \Exception |
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317 | */ |
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318 | private function parseSegment($index, array &$register, $segment) |
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333 | |||
334 | /** |
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335 | * @param int $index |
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336 | * @param array $register |
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337 | * @param string $element |
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338 | * @throws \Exception |
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339 | */ |
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340 | private function parseElement($index, array &$register, $element) |
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360 | |||
361 | /** |
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362 | * Parse range of values, e.g. "5-10" |
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363 | * |
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364 | * @param int $index |
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365 | * @param array $register |
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366 | * @param string $range |
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367 | * @param int $stepping |
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368 | * @throws \Exception |
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369 | */ |
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370 | private function parseRange($index, array &$register, $range, $stepping) |
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382 | |||
383 | /** |
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384 | * Parse stepping notation, e.g. "5-10/2" => 2 |
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385 | * |
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386 | * @param int $index |
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387 | * @param string $element |
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388 | * @param int $stepping |
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389 | * @throws \Exception |
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390 | */ |
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391 | private function parseStepping($index, &$element, &$stepping) |
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400 | |||
401 | /** |
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402 | * Validate whether a given range of values exceeds allowed value boundaries |
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403 | * |
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404 | * @param int $index |
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405 | * @param array $range |
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406 | * @return array |
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407 | * @throws \Exception |
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408 | */ |
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409 | private function validateRange($index, array $range) |
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421 | /** |
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422 | * @param int $index |
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423 | * @param int $value |
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424 | * @throws \Exception |
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425 | */ |
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426 | private function validateValue($index, $value) |
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437 | |||
438 | /** |
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439 | * @param int $index |
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440 | * @param array $segments |
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441 | * @throws \Exception |
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442 | */ |
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443 | private function validateStepping($index, array $segments) |
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453 | |||
454 | /** |
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455 | * @param int $index |
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456 | * @param array $register |
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457 | * @param array $range |
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458 | * @param int $stepping |
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459 | */ |
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460 | private function fillRegister($index, array &$register, array $range, $stepping) |
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472 | |||
473 | /** |
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474 | * @param int $index |
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475 | * @param array $register |
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476 | * @param array $range |
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477 | * @param int $value |
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478 | */ |
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479 | private function fillRegisterAcrossBoundaries($index, array &$register, $range, $value) |
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485 | |||
486 | /** |
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487 | * @param int $index |
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488 | * @param array $register |
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489 | * @param array $range |
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490 | * @param int $value |
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491 | */ |
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492 | private function fillRegisterBetweenBoundaries($index, array &$register, $range, $value) |
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498 | } |
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499 |
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.