Select your answer: 🧐

  A: TypeError int expected   B: TypeError string expected   C: Fatal declaration compat.   D: boolean

Submit

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✅ { answer }: correct!

❌ { answer }: Wrong answer!

It is possible that two implemented interfaces use the same name, but the signatures must be identical. Since PHP 8, contravariance allows to widen the parameter type, so this code is allowed.

▶  Click here to run this code on 3v4l.org

Poll

• A: TypeError int expected - 10%
  percent%
• B: TypeError string expected - 8%
  percent%
• C: Fatal declaration compat. - 51%
  percent%
• ✅ D: boolean - 31%
  percent%

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Going further... 🤓

• Read the contravariance documentation on php.net

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