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Is Multiple Inheritance allowed at class level in PHP?
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PHP programming language doesn't even support the multiple inheritance/inheritances. PHP supports multiple inheritances only by using interfaces or Traits in PHP instead of classes so that we can implement it. Traits are a type of class that enables multiple case classes, objects, classes, and traits.
Multiple inheritance is not supported by Java using classes, handling the complexity that causes due to multiple inheritances is very complex.
What is Multiple Inheritance? Multiple inheritances are one of the four pillars of OOP object-oriented programming, consisting of a child class or a subclass inheriting the traits from multiple parent classes or superclasses.
Java doesn't support multiple inheritances in classes because it can lead to diamond problem and rather than providing some complex way to solve it, there are better ways through which we can achieve the same result as multiple inheritances.
Multiple inheritance suffers from the Diamond Problem, which has not been (agreed upon how to be) solved in PHP yet. Thus, there is no multiple inheritance in PHP.
BaseClass
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ClassA ClassB
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ClassC
If both ClassA and ClassB defined their own method foo(), which one would you call in ClassC?
You are encouraged to either use object composition or interfaces (which do allow multiple inheritance) or - if you are after horizontal reuse - look into the Decorator or Strategy pattern until we have Traits (or Grafts or whatever they will be called then).
Some Reference:
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