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Always generate fatal error for LSP failures #4000

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commented Mar 28, 2019


When a method signature (LSP) check during inheritance fails, always generate a fatal compile error. Previously, this generated either a warning or a fatal error based on the following rules:

  • If the method signatures have an incompatible return type, generate a fatal error.
  • If the prototype of the method is abstract (or part of an interface), generate a fatal error.
  • Otherwise, generate a warning. Prior to PHP 7.0 a strict standards warnings was generated.

This change removes the distinction between abstract and non-abstract methods and always generates a fatal error.

@nikic nikic added the RFC label Mar 28, 2019

@nikic nikic force-pushed the nikic:inheritance-error branch from 214943d to bc1eaaf Mar 28, 2019

Class D extends C { function f(array $a) {} }
Warning: Declaration of D::f(array $a) should be compatible with C::f($a) in %s on line 5
Array hint, should be nothing.

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morrisonlevi Apr 8, 2019


The ==DONE== looks like it was removed from expected text, but not from the program.

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