从数据库检索时，PHP 显示奇怪的条目

Question

我已经编写了这段 PHP 代码，但它给出了一些奇怪的结果。片段是

$queryIsbnArr = mysql_query("select ISBN from quotation_master") or die(mysql_error());
            $row = mysql_fetch_array($queryIsbnArr) or die(mysql_error()); 
            print_r($row);
            $_SESSION['isbnArr'] = $row;

查询给出的输出是..

Array ( [0] => 12121 [ISBN] => 12121 ) 

当在数据库上运行时查询的输出是

12121
56

哪个是正确的，那么这有什么问题呢？

Answer 1

阅读the manual !

Returns an array of strings that corresponds to the fetched row, or FALSE if there are no more rows. The type of returned array depends on how result_type is defined. By using MYSQL_BOTH (default), you'll get an array with both associative and number indices.

mysql_fetch_array() 获取每行数据的数值数组和关联数组。您需要使用 或 另一个来获取实际数据，因为 $row 包含作为数组的整个数据集，即使它只有一个值也是如此。

$queryIsbnArr = mysql_query("select ISBN from quotation_master") or die(mysql_error());
$row = mysql_fetch_assoc($queryIsbnArr) or die(mysql_error()); 
print_r($row['ISBN']);
$_SESSION['isbnArr'] = $row;

仅供引用，you shouldn't use mysql_* functions in new code .它们不再维护 and are officially deprecated .查看red box ？了解 prepared statements相反，并使用 PDO或 MySQLi - this article将帮助您决定选择哪个。如果选择 PDO，here is a good tutorial .