php - mysqli_fetch_array 和 MYSQLI_BOTH 有什么区别？

Question

我知道

mysqli_fetch_assoc,
mysqli_fetch_array,
mysqli_fetch

但是，MYSQLI_BOTH 等于 mysqli_fetch_array 还是它们实际上不同？

Answer 1

来自 PHP 手册:

By using the MYSQLI_ASSOC constant this function will behave identically to the mysqli_fetch_assoc(), while MYSQLI_NUM will behave identically to the mysqli_fetch_row() function. The final option MYSQLI_BOTH will create a single array with the attributes of both.

这些是可选参数，用于指示将返回什么类型的数组。

这里是基本的例子:

$result->fetch_array(MYSQLI_NUM);

array(
    0 => "val 1",
    1 => "val 2"
);

$result->fetch_array(MYSQLI_ASSOC);

array(
    'key0' => "val 1",
    'key1' => "val 2"
);

$result->fetch_array(MYSQLI_BOTH);

array(
    0 => "val 1",
    'key0' => "val 1",
    1 => "val 2",
    'key1' => "val 2"
);

PHP Manual