Understanding of php object-oriented polymorphism

To improve the scalability of object-oriented code, we need to reduce the application of logic judgment statements in actual development, where the strong polymorphism lies. & Amp; lt ;? PhpclassAnimal {functionmakeSound (){

To improve the scalability of object-oriented code, we need to reduce the application of logic judgment statements in actual development, where the strong polymorphism lies.

 MakeSound ();} else {print "transfer error! ";}} PrintTheSound (new Cat (); printTheSound (new Dog ()?>

The running result is as follows:
Meow
Wang
It can be seen from the above: no matter how many animals are added, you just need to declare it with extends and then call the printTheSound () function.
It is worth mentioning that php does not support inheritance of multiple classes.