实现PHP接口，使对象实例可以作为数组类型参数传递？

Question

In PHP it is possible to specify argument types although they call it type hinting.

I am implementing an interface where one of the functions specifies an array as the argument type:

function myFunction(array $argument){
}

I'd like to define a class, an instance of which can be used as the argument for this function. In other words it would extend ArrayObject or implement ArrayAccess or something along those lines.

Is there a built in interface or abstract class that will work for this? (ArrayObject doesn't)

Answer 1

There isn't, but I'd suggest two alternatives:

1. Remove the array specifier and rather check within the function using is_array and instanceof ArrayObject
2. Use (array) $ArrayObject when calling the routine or as part of 1. above.

Example for soulmerge :-)

function myFunction(array $argument){
    echo var_export($argument,true);
}
$a = new ArrayObject();
$a[] = 'hello';
$a[] = 'and goodbye';

myFunction((array)$a);  

outputs

 array (
   0 => 'hello',
   1 => 'and goodbye',
 )