How to declare abstract method in non-abstract class in PHP?

Question

class absclass {
    abstract public function fuc();
}

reports:

PHP Fatal error: Class absclass contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (absclass::fuc)

I want to know what it means by implement the remaining methods,how?

Answer 1

See the chapter on Class Abstraction in the PHP manual:

PHP 5 introduces abstract classes and methods. Classes defined as abstract may not be instantiated, and any class that contains at least one abstract method must also be abstract. Methods defined as abstract simply declare the method's signature - they cannot define the implementation.

It means you either have to

abstract class absclass { // mark the entire class as abstract     abstract public function fuc(); } 

or

class absclass {     public function fuc() { // implement the method body         // which means it won't be abstract anymore     }; } 

Answer 2

I presume that remaining methods actually refers to the abstract methods you're trying to define (in this case, fuc()), since the non-abstract methods that might exist are okay anyway. It's probably an error message that could use a more precise wording: where it says remaining it could have said abstract.

The fix is pretty straightforward (that part of the error message is fine): you need to change this:

abstract public function fuc();

... into a proper implementation:

public function fuc(){
    // Code comes here
}

... or, alternatively and depending your needs, make the whole class abstract:

abstract class absclass {
    abstract public function fuc();
}