PHP while循环输出到变量

Question

I have the following loop to get data from a database...

$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 />";
}

which outputs the following:

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

The following:

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

and...

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

...are simply there for testing and to help explain my issue. How would I go about putting the output into variables like so:

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

Many Thanks

Answer 1

You can use {} , try this:

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

Another easier way is to use keys and values of arrays. Keep the key as

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

Iterate over the array and print/access the values.

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

I could show you a hackish way of doing it, but I'd like to show you a different approach using arrays:

$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']);
}

After this, you'll have a nice array of all metals ( var_dump($metals); ).

Accessing it like this:

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

If you really insist on using your approach,

$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'];
}

should work.

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

Modify your code this way:

$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;
}

Then you can access the values in the $values array:

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