语法Help - 变量中的变量引用

Question

I have the below foreach loop

$i = 1;
    $array = array();
    foreach ($titles as $title){
        if (empty($title) ){
            echo "EMPTY " .$i ;
        }else{
            array_push($array, $_POST['miles'.$i.'1']);
        }
        $i++;
    }

The line array_push($array, $_POST['miles'.$i.'1']); should add to the array the value of $_POST['miles11'] on the first loop (so long as $title is not empty).

And then on the next loop value of $_POST['miles21'] etc. etc.

However this does not work as nothing actually gets added to the array just an empty item. I assume I do not have the syntax right for doing the above but I am not sure what is the correct way to do it.

Thank you

Examples

If all $titles are not empty the array looks like:

 Array ( [0] => [1] => [2] => [3] => [4] => [5] => [6] => ) 

If some are empty we get for example:

EMPTY 1EMPTY 3EMPTY 5EMPTY 7Array ( [0] => [1] => [2] => ) 

Answer 1

array_push($array, $_POST['miles'.$i.'1']);

actually needs to be

array_push($array, $_POST['miles1'.$i]);

after looking at my $_POST again