In PHP, an abstract class is one in which there is at least one abstract method. An abstract method is one that is declared as a method but not implemented in the code as the same.

BY BIQ ON 15 Jul 2020
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Example

                                        
abstract class ParentClass {

  abstract public function someMethod1();

  abstract public function someMethod2($name, $color);

  abstract public function someMethod3() : string;

}

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