问如何通过php找到给定十进制值的位置值？

EN

$str = '23.56';
$strdiv = explode('.', $str);
$before = array('Tens', 'Ones');
$after = array('Hundredths', 'Thousandths');
$counter = 0;
foreach($strdiv as $v) {
  for($i=0; $i<strlen($v); $i++) {
     if(!empty($v)) {
       if($counter == 0) {
         $newarr[] = substr($v,$i, 1).' - '.$before[$i];
       }
       if($counter == 1) {
         $newarr[] = substr($v,$i, 1).' - '.$after[$i];
       }
     }
  }
  $counter++;
}
echo implode(', ',$newarr); //2 - Tens, 3 - Ones, 5 - Hundredths, 6 - Thousandths 

  <?php
$mystring = '123.64';
$findme   = '.';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of '.' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}
?>

$num = 23.56;
$arr = array("Tens","Ones","Hundredths","Thousandths");
$num = str_replace(".","",$num);

for ($i=0;$i<strlen($num);$i++) {

        $res[] = $num[$i] ." - ".$arr[$i];
}

echo implode(', ',$res);