how to take a Value from a javascript variable, to be used as a php input variable via a button, without or not a submit button?

how to take a Value from a javascript variable, to be used as a php input variable via a button, not a submit button because the submit button cannot generate sequences more than once at the same time? I have tried this method but I still can't get the output ("x") from js using the button. this is my first code with javascript I tried as best I could because I tried to use break but it didn't work then i put x-- to freze it.

this javascript work like i want, but still can't get value "x" from button value

Code:

    
    


$a = array("str1", "str2", "str3", "str4", "str5");

if (isset($_POST['soal']))
{
    $va = $_POST['soal'];
    print $a[$va];
}
?>

on delphi I always use this method and I also tried to implement it but it didn't work so I tried making it with java script.

Delphi Example Code:

//global var
const
    a : array[0..4] of string = ('str1', 'str2', 'str3',  'str4', 'str5');
 var
    g : integer;
    ...
    ...
    //on create

    g := 0;
    ...
    ...
    //on button click
    g := g + 1;
 if g = 5 then
    g = 0;
    edit1.text := IntToStr(g);

  //or like this example 2

   button1.tag := button1.tag + 1;
if button1.tag = 5 then
   button1.tag := 0;       
   edit1.text := IntToStr(button1.tag);

php code was i tried, like this

function fNext();
{

    $x = 0;
    if ($x == 5)
    {
        break;
    }
    x += 1;
}

i'm sorry if i included pascal/delphi code, cz maybe you can help me to convert it into php.

Thank you.