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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11 | class StaffController extends Controller |
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12 | { |
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13 | |||
14 | public function __construct() |
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15 | { |
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16 | $this->middleware('auth'); |
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17 | $this->middleware('lang'); |
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18 | } |
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19 | |||
20 | /** |
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21 | * Display all the staff. |
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22 | * |
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23 | * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View |
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24 | */ |
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25 | public function index() |
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26 | { |
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27 | $data['users'] = User::all(); |
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28 | return view('users/index', $data); |
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29 | } |
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30 | |||
31 | /** |
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32 | * Set the user available. |
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33 | * |
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34 | * @return \Illuminate\Http\RedirectResponse |
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35 | */ |
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36 | View Code Duplication | public function setAvailable() |
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37 | { |
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38 | $user = User::find(auth()->user()->id); |
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39 | Bouncer::retract('unavailable')->from($user); |
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40 | Bouncer::assign('available')->to($user); |
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41 | |||
42 | return redirect()->back(302); |
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43 | } |
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44 | |||
45 | /** |
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46 | * Set the user unavailable. |
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47 | * |
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48 | * @return \Illuminate\Http\RedirectResponse |
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49 | */ |
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50 | View Code Duplication | public function setUnavailable() |
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51 | { |
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52 | $user = User::find(auth()->user()->id); |
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53 | Bouncer::retract('available')->from($user); |
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54 | Bouncer::assign('unavailable')->to($user); |
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55 | |||
56 | return redirect()->back(302); |
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57 | } |
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58 | |||
59 | /** |
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60 | * Display the profile. |
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61 | * |
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62 | * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View |
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63 | */ |
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64 | public function profile() |
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68 | |||
69 | public function destroy($id) |
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70 | { |
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71 | $user = User::find($id); |
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72 | |||
80 | } |
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81 |
Adding an explicit array definition is generally preferable to implicit array definition as it guarantees a stable state of the code.
Let’s take a look at an example:
As you can see in this example, the array
$myArray
is initialized the first time when the foreach loop is entered. You can also see that the value of thebar
key is only written conditionally; thus, its value might result from a previous iteration.This might or might not be intended. To make your intention clear, your code more readible and to avoid accidental bugs, we recommend to add an explicit initialization $myArray = array() either outside or inside the foreach loop.