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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7 | trait RecurringProfiles |
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8 | { |
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9 | /** |
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10 | * Create recurring subscription on custom frequency basis. |
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11 | * The billing frequency is in months, i.e: if you want a monthly subscription, then your billing frequency would be 1. |
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12 | * |
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13 | * @param string $token |
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14 | * @param float $amount |
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15 | * @param string $description |
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16 | * @param int $billingFrequency |
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17 | * @param int $trialDays |
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18 | * |
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19 | * @return array |
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20 | */ |
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21 | public function createCustomSubscription($token, $amount, $description, $billingFrequency, $trialDays = null) |
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41 | |||
42 | /** |
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43 | * Create recurring subscription on monthly basis. |
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44 | * |
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45 | * @param string $token |
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46 | * @param float $amount |
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47 | * @param string $description |
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48 | * |
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49 | * @return array |
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50 | */ |
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51 | View Code Duplication | public function createMonthlySubscription($token, $amount, $description) |
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64 | |||
65 | /** |
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66 | * Create recurring subscription on yearly basis. |
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67 | * |
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68 | * @param string $token |
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69 | * @param float $amount |
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70 | * @param string $description |
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71 | * |
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72 | * @return array |
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73 | */ |
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74 | View Code Duplication | public function createYearlySubscription($token, $amount, $description) |
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87 | } |
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88 |
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: