json_encode之后,json数据变成[{"a","1"}],怎么改成{"a","1"}
function get_js_array($sql){
$result = mysql_query($sql);
$arr = array();
while($row = mysql_fetch_array($result, MYSQL_ASSOC)){
$arr[] = $row;
}
$js = json_encode($arr);
mysql_free_result($result);
mysql_close($conn);
return $js;
}