PHP while循环输出到变量

Question

我有以下循环从数据库获取数据...

$query = "SELECT id, metal, colour, value FROM data WHERE asset='gold' OR asset='silver' ORDER BY id DESC LIMIT 2";
$result = mysqli_query($connect, $query);
while ($row = mysqli_fetch_assoc($result)){
    echo $row['metal'] . " is " . $row["colour"] . "<br />";
    echo $row['metal'] . " is worth " . $row["value"] . "<br />";
}

输出以下内容：

silver is grey
silver is worth 50
gold is yellow
gold is worth 100

下列：

echo $row['metal'] . " is " . 

和...

echo $row['metal'] . " is worth " . 

...只是在这里进行测试并帮助解释我的问题。 我将如何将输出放入这样的变量中：

$silverColour = grey
$silverValue = 50
$goldColour = yellow
$goldValue = 100

非常感谢

Answer 1

您可以使用{} ，试试这个：

  ${$row['metal'].'Color'} = $row["colour"]; 
  ${$row['metal'].'Value'}= $row["value"];

另一个更简单的方法是使用键和数组的值。 保持为

 $array[row['metal'].'Color']= $row["colour"];
 $array[row['metal'].'Value']= $row["value"];

遍历数组并打印/访问值。

Answer 2

$query = "SELECT id, metal, colour, value FROM data WHERE asset='gold' OR asset='silver' ORDER BY id DESC LIMIT 2";
$result = mysqli_query($connect, $query);
while ($row = mysqli_fetch_assoc($result)){
 ${$row['metal'].'color'} = $row['metal'];
 ${$row['metal'].'value'} = $row['value'];
}

Answer 3

我可以向您展示一种骇人听闻的方法，但我想向您展示使用数组的另一种方法：

$query = "SELECT id, metal, colour, value FROM data WHERE asset='gold' OR asset='silver' ORDER BY id DESC LIMIT 2";
$result = mysqli_query($connect, $query);
$metals = array();
while ($row = mysqli_fetch_assoc($result)){
    $metals[$row['metal']] = array('color' => $row['color'], 'value' => $row['value']);
}

之后，您将拥有一个很好的所有金属阵列（ var_dump($metals); ）。

像这样访问它：

$metals['gold']['color'];
$metals['gold']['value'];

如果您真的坚持使用您的方法，

$query = "SELECT id, metal, colour, value FROM data WHERE asset='gold' OR asset='silver' ORDER BY id DESC LIMIT 2";
$result = mysqli_query($connect, $query);
while ($row = mysqli_fetch_assoc($result)){
    ${$row['metal'] . 'Color' } = $row['color'];
    ${$row['metal'] . 'Value' } = $row['value'];
}

应该管用。

Answer 4

$color= array();
$values= array();
while (($row = mysqli_fetch_assoc($result)) {
   $color[] = (string) $row["colour"];
   $color[] = (string) $row["value"];
}

// If you don't want an array, but a string instead, use implode:

$color= implode(' ', $color)
$values= implode(' ', $values)

Answer 5

以这种方式修改代码：

$values = [];
$result = mysqli_query($connect, $query);
while ($row = mysqli_fetch_assoc($result)){
    echo $row['metal'] . " is " . $row["colour"] . "<br />";
    echo $row['metal'] . " is worth " . $row["value"] . "<br />";
    $values[$row['metal']] = $row;
}

然后，您可以访问$values数组中的$values ：

echo '$silverColour = '. $values['silver']['colour'];
echo '$silverValue = '. $values['silver']['value'];
echo '$goldColour = '. $values['gold']['colour'];
echo '$goldValue = '. $values['gold']['value'];