简单循环不显示数据[重复]

Question

这让我很困惑.. 简单的获取和循环不显示任何数据 表中有数据显示结果循环外返回数据

$dbc = mysqli_connect($dbh, $dbu, $dbp, $dbn);
$query = mysqli_query($dbc,"SELECT * FROM `products`");
$res = mysqli_fetch_assoc($query);
$rows = array();
do {
    $rows[] = $res['product'];

}while($res = mysqli_fetch_assoc($query)) ;
$data = json_encode($rows);
echo $data;
echo mysqli_error($dbc);

添加：

返回数组中的数据

<pre>Array
(
    [ID] => 1
    [list_name] => Dry Fruits
    [cat] => Dry Fruits and Nuts
    [item_code] => 1049
    [pack_style] => 106
    [packstyle_active] => Y
    [style_desc] => Stabilo250
    [system_wt] => 0.25
    [weight_desc] => 250gm
    [declared_weight] => 0.25
    [declared_weight_desc] => 250gm
    [uom] => gm
    [qty_in_case] => 1
    [case_size] => 1 x 250gm
    [product] => Almond Sliced
    [weight_code] => 126
    [qty_code] => 00
    [product_code] => 1049-106-126-00
    [barcode] => 502185878567
    [barcode13] => 5021858785678
    [sequence_no] => 78567
    [sage_code] => 104978567
    [active] => N
    [allergen] => Y
    [origin] => Various
    [density] => 0
    [processtype] => PT32
    [processed_by] => FGS
    [Industrial] => N
    [Catering] => N
    [RetailEthnic] => Y
    [RetailMainstream] => N
    [Website] => N
    [Special] => N
    [zohoitemcode] => 1540890000001353073
)

所以我认为这是 json_encode 的问题.. 可能

    print_r($rows) 
    Array
   (
    [0] => Almond Sliced
    [1] => Almond Sliced
    [2] => Almond Sliced
    [3] => Almond Sliced
    [4] => Almond Sliced
    [5] => Almond Sliced
    [6] => Almond Sliced
    [7] => Almond Sliced
    [8] => Almond Sliced
    [9] => Almond Sliced
    [10] => Almond Sliced
    [11] => Almond Sliced
    [12] => Almond Sliced
    [13] => Almond Sliced
    [14] => Almond Sliced
    [15] => Almond Sliced
    )

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Answer 1

这似乎是一个奇怪的编码问题。在 while 循环中添加了一行以强制编码为 UTF-8。

$dbc = mysqli_connect($dbh, $dbu, $dbp, $dbn);
$query = "SELECT * FROM `products`";
$stmt = $dbc->prepare($query);
$stmt->execute();
$results = $stmt->get_result();

while($res = $results->fetch_assoc()){

  $rows[] = mb_convert_encoding($res['product'], 'UTF-8', 'UTF-8');

}

echo '<pre>';
print_r($rows);
echo '</pre>';

$data = json_encode($rows);
echo $data;

echo mysqli_error($dbc);

Answer 2

尝试将循环更改为以下内容：

foreach($res as $val) {
    $rows[] = $val['product'];
}

此外，如果它仍然不起作用。那么：

echo "<pre>";
print_($res);
die(); 

请发布输出。

编辑：1

你不需要 foreach 循环。

你可以直接做：

$data = json_encode($res);
echo $data;