1 | <?php |
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9 | class GitIgnoreWriterHandler implements CommandHandlerInterface |
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10 | { |
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11 | /** |
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12 | * @var WriterInterface |
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13 | */ |
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14 | private $gitIgnoreWriter; |
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15 | |||
16 | /** |
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17 | * GitIgnoreWriter constructor. |
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18 | * |
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19 | * @param WriterInterface $gitIgnoreWriter |
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20 | */ |
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21 | 1 | public function __construct(WriterInterface $gitIgnoreWriter) |
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25 | |||
26 | /** |
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27 | * @param string $content |
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28 | */ |
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29 | 1 | private function write($content) |
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33 | |||
34 | /** |
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35 | * @param CommandInterface|GitIgnoreWriter $command |
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36 | */ |
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37 | 1 | public function handle(CommandInterface $command) |
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41 | } |
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42 |
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: