$sum = 888;
$arr = str_split($sum);//拆分数字为数组
$res = '';
for($i =0;$i<count($arr);$i++){
$res+=$arr[$i];
}
echo $res;
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$sum = 888;
$arr = str_split($sum);//拆分数字为数组
$res = '';
for($i =0;$i<count($arr);$i++){
$res+=$arr[$i];
}
echo $res;
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