PHP For Each 循环输出两倍于应有的输出

Question

我正在运行下面的代码来回显 MySQL 数据库中单行的内容，它目前输出的内容似乎是输出的两倍。见下文

$result = mysql_query("SELECT * FROM table WHERE this='1'") or die(mysql_error()); 
$row = mysql_fetch_array($result);
    foreach($row as $key => $field) {
        if($key != 'id' && $key != 'doss' && $key != ''){
            echo "Field name: $key = $field<br />";
            $missing =$missing+$field;
        }
     }

输出是:

Field name: 1 = 0
Field name: go = 0
Field name: 2 = 1
Field name: het = 1
Field name: 3 = 0
Field name: quf = 0
Field name: 4 = 0
Field name: sid = 0
Field name: 5 = 1
Field name: ram = 1
Field name: 6 = 1

Answer 1

mysql_fetch_array 将生成一个包含数字键和关联键的数组。

默认定义是:

array mysql_fetch_array ( resource $result [, int $result_type = MYSQL_BOTH ] )

如果要获取唯一值，请使用 MYSQL_ASSOC 或 MYSQL_NUM