php输出json数组和json

function getCitys(){

$provinceprovince']);

$citylist=M('city')->field('cityid,cityname')->where('provinceid ='.$provinceid)->select(); //这个方法输出json数组

//echo json_encode($citylist);

$temp='{';

for ($i=0;$i<count($citylist);$i++){

if($i==count($citylist)-1){

$temp=$temp.'"'.$citylist[$i]['cityid'].'":"'.$citylist[$i]['cityname'].'"';

}else{

$temp=$temp.'"'.$citylist[$i]['cityid'].'":"'.$citylist[$i]['cityname'].'",';

}

}

$temp=$temp.'}';

echo $temp;

}