Interface and abstract method View as Markdown

Hi,

In the SPL there is some interface that have abstract method:

Countable {
/* Methods */
abstract public int count http://www.php.net/manual/en/countable.count.php
( void )
}

While some interface have "none abstract" method.

OuterIterator extends Iterator
http://www.php.net/manual/en/class.iterator.php {
/* Methods */
public Iterator getInnerIterator
http://www.php.net/manual/en/outeriterator.getchildren.php ( void )
..snip..
}

Does  "abstract" keyword have a semantic?

Thanks

--Mathieu suen

http://docs.php.net/abstract

By the nature of the method being in an interface, it is automatically
abstract - there is no code behind the method in an interface. So you
must supply the code in any class that implements the interface.
Unless the sub-class is declared as an abstract class ...

<?php
abstract class counter implements countable {
}

class counting extends counter {
public function count() {
return 1;
}
}

$a = new counting();
echo $a->count();
?>

--

Richard Quadling
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Normally, PHP won't allow access types for interface methods, but the
reflection for SPL is defined inside the C code:

static const zend_function_entry spl_funcs_OuterIterator[] = {
SPL_ABSTRACT_ME(OuterIterator, getInnerIterator,
arginfo_recursive_it_void)
{NULL, NULL, NULL}
};

IMO the SPL_ME should be used instead, but I wouldn't be bothered about it ;-)

On Tue, May 18, 2010 at 11:12 PM, mathieu.suen
mathieu.suen@easyflirt.com wrote:

Hi,

In the SPL there is some interface that have abstract method:

Countable {
/* Methods */
abstract public int count http://www.php.net/manual/en/countable.count.php
( void )
}

While some interface have "none abstract" method.

OuterIterator extends Iterator
http://www.php.net/manual/en/class.iterator.php {
/* Methods */
public Iterator getInnerIterator
http://www.php.net/manual/en/outeriterator.getchildren.php ( void )
..snip..
}

Does  "abstract" keyword have a semantic?

Thanks

--Mathieu suen

--

Tjerk