<?php
$sayi = 1453;
$kactane = strlen($sayi)-1;
$virgul = chunk_split($sayi,1,",");
$parca = explode(",",$virgul);
$toplam="";
for($i=0;$i<=$kactane;$i++)
{
$toplam = $parca[$i]+$toplam;
}
echo $toplam;
?>