Question

How would I check if an array(with three values) that was passed to a function from another file has all three values?
For example I want to get an error if someone puts in $ids=Api_Books_Book::getTest(array(1,2,)); (There is no value on the the third key/index).

this is my code so far

public static function getTest($ids){
        $input_result = array(
                      );

        foreach ($ids as $id) {
       $input_result['result']['Id '.$id] =  $id;
       }

            if((array_key_exists('0',$ids))){

            echo "You have inputted some data in the Api_Books_Book::getTest<br/>";
            $input_success = "Successful!";
        }
        else 
        {
            echo "There is no data<br/>";
            $input_success = "Not Successful";
        }

        $result=array('status'=>$input_success,
                      'message'=>"some errors will be displayed here",
                      'result'=> $input_result
                     );



        rdie($result);



                return $result;
}

Answer 1

If you have simple numerically indexed arrays, the only thing that makes sense is count:

if (count($array) != 3) // not valid

or:

if (count($array) < 3) // not valid

You can use $array = array_values($array) to reset the numeric keys to make sure the values are at index [0], [1] and [2] and not any other indexes.

If you have key => value pairs and you expect certain keys to be set, use array_diff_key:

$expectedKeys = array('foo', 'bar', 'baz');
if (array_diff_key(array_flip($expectedKeys), $array)) // not valid