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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5 | trait Friendable |
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6 | { |
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7 | 34 | public function checkFriendship($user) |
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8 | { |
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9 | 34 | if ($this->id == $user->id) { |
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10 | 2 | return 'same_user'; |
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11 | } |
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12 | |||
13 | 32 | $friendship = Friendship::betweenUsers($this, $user) |
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14 | 32 | ->first(); |
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15 | |||
16 | 32 | if (!$friendship) { |
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17 | 32 | return 'not_friends'; |
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18 | } |
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19 | |||
20 | 30 | if ($friendship->status == 1) { |
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21 | 8 | return 'friends'; |
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22 | } |
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23 | 30 | if ($friendship->requester == $this->id) { |
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24 | 10 | return 'waiting'; |
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25 | } |
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26 | 28 | if ($friendship->user_requested == $this->id) { |
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27 | 28 | return 'pending'; |
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28 | } |
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29 | } |
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30 | |||
31 | 34 | public function addFriend($recipient) |
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32 | { |
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33 | 34 | $friendshipStatus = $this->checkFriendship($recipient); |
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34 | |||
35 | 34 | if ($friendshipStatus == 'not_friends') { |
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36 | 32 | Friendship::create([ |
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37 | 32 | 'requester' => $this->id, |
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38 | 32 | 'user_requested' => $recipient->id, |
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39 | ]); |
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40 | 32 | event('friendrequest.sent', [$this, $recipient]); |
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41 | } |
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42 | |||
43 | 34 | return $friendshipStatus == 'not_friends'; |
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44 | } |
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45 | |||
46 | 22 | public function acceptFriend($sender) |
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47 | { |
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48 | 22 | $friendshipStatus = $this->checkFriendship($sender); |
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49 | |||
50 | 22 | if ($friendshipStatus == 'pending') { |
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51 | 20 | Friendship::betweenUsers($this, $sender) |
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52 | 20 | ->update(['status' => 1]); |
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53 | 20 | event('friendrequest.accepted', [$this, $sender]); |
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54 | } |
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55 | |||
56 | 22 | return $friendshipStatus == 'pending'; |
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57 | } |
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58 | |||
59 | 10 | public function deleteFriend($user) |
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71 | |||
72 | 6 | public function friends_ids() |
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73 | { |
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74 | $friendsIds = Friendship::where(function ($query) { |
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85 | |||
86 | 4 | public function friends() |
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94 | |||
95 | 14 | View Code Duplication | public function friendRequestsReceived() |
105 | |||
106 | 8 | View Code Duplication | public function friendRequestsSent() |
116 | |||
117 | 4 | public function isFriendsWith($user) |
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123 | |||
124 | 2 | public function mutualFriends($user) |
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133 | } |
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134 |
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: