php 运算符优先级：算术运算与字符连接运算同级
$sql=”delete from `log_view` where `dz_uid`={$dz_uid} and `time`>”.$today_unixtime-86400;
$sql=”delete from `log_view` where `dz_uid`={$dz_uid}[……]
这是fengyqf的博客
$sql=”delete from `log_view` where `dz_uid`={$dz_uid} and `time`>”.$today_unixtime-86400;
$sql=”delete from `log_view` where `dz_uid`={$dz_uid}[……]