// The ReadTextFile function contains 2 parameters:
// 1st peremeter is $arr (array)
// 2nd peremeter is $myFunction (function)
function GoInArray($arr, $myFunction)
{
     for($i=0; $i < count($arr); $i++)
          $myFunction($arr[$i]); // For each element, I call $myFunction
}


$my_arr1 = array(1, 6, 7, 8);

function ShowValue($item)
{
     echo $item;
}

// The second parameter is to pass the
GoInArray($my_arr1, "ShowValue" );