PHP：MY​​SQL数组到JSON停止重复？

Question

因此，每当我从我的mysql数据库下载数据，并通过PHP转换为JSON数组然后显示它，我就会得到重复的值。

我明白为什么会这样，但有没有办法删除数字副本？：/

{"id":"1","0":"1","userId":"23","1":"23","message":"HELLO","2":HELLO"},
{"id":"2","0":"2","userId":"53","1":"53","message":"WOW","2":WOW"}

Answer 1

对于PDO，在查询执行后使用PDO::FETCH_ASSOC标志

$sth = $dbh->prepare("SELECT col FROM table");
$sth->execute();
$result = $sth->fetchAll(PDO::FETCH_ASSOC);
echo json_encode($result);

对于mysql_ *函数：

$query = "SELECT col FROM table";
$result = mysqli_query($connection, $query);
$output = array();
while($row = mysqli_fetch_assoc($result)){
    $output[] = $row;
}
json_encode($output);

Answer 2

正如您所问，要删除它： 如果key是数字删除，则遍历它。

foreach($array as $key=>$var){ 
    if(is_numeric($key)){ 
        delete $array[$key]; 
    } 
}