有没有更快的方法来选择PHP中的HTML下拉列表的“选定”值？

Question

I'm currently using this garbage code to select the correct selected="selected" value for my HTML dropdown. There has got to be a better way... maybe with a switch statement or something else?

Any tips on how to make this more efficient?

if ($quantity == 0)
{
    echo '
    <option selected="selected" value="0">0</option>
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
    <option value="5">5</option>
    <option value="6">6</option>
    <option value="7">7</option>
    <option value="8">8</option>
    <option value="9+">9+</option>
    ';
}
else if ($quantity == 1)
{
    echo '
    <option value="0">0</option>
    <option selected="selected" value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
    <option value="5">5</option>
    <option value="6">6</option>
    <option value="7">7</option>
    <option value="8">8</option>
    <option value="9+">9+</option>
    ';
    }
else if ($quantity == 2)
{
    echo '
    <option value="0">0</option>
    <option value="1">1</option>
    <option selected="selected" value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
    <option value="5">5</option>
    <option value="6">6</option>
    <option value="7">7</option>
    <option value="8">8</option>
    <option value="9+">9+</option>
    ';
}
else if ($quantity == 3)
{
    echo '
    <option value="0">0</option>
    <option value="1">1</option>
    <option value="2">2</option>
    <option selected="selected" value="3">3</option>
    <option value="4">4</option>
    <option value="5">5</option>
    <option value="6">6</option>
    <option value="7">7</option>
    <option value="8">8</option>
    <option value="9+">9+</option>
    ';
}  etc....

Answer 1

This should work for you:

echo "<select>";
for($count = 0; $count < 10; $count++)
    echo "<option " . ($quantity == $count ? 'selected': '') . " value='$count'>$count</option>";
echo "</select>";