$arr = mssql_fetch_array($rresult);
if($arr){
echo $arr[0]." ";
echo $arr[1]." ";
echo $arr[2]." ";
echo $arr[3]." ";
}
else
echo "0";
===>
while($arr = mssql_fetch_array($rresult)) {
echo $arr[0]." ";
echo $arr[1]." ";
echo $arr[2]." ";
echo $arr[3]." ";
}
if($arr){
echo $arr[0]." ";
echo $arr[1]." ";
echo $arr[2]." ";
echo $arr[3]." ";
}
else
echo "0";
===>
while($arr = mssql_fetch_array($rresult)) {
echo $arr[0]." ";
echo $arr[1]." ";
echo $arr[2]." ";
echo $arr[3]." ";
}
while和if 有什么区别,为什么要先用if,再用while