Question

如果我的变量$ amount等于零，我试图回复€00.00

我做错了你可以帮忙吗??

代码

while ($row9 = mysql_fetch_array($result9))
{
$amount = $row9['amount'];
}
//$amount = $amount / 60;
//$amount = round($amount, 2);
if $amount == 0 echo "<b>Balance: &#8364;00.00</b>";
else
echo "<b>Balance: $$amount</b>";

Answer 1

你需要将if / else放在循环中，并且你有一些无效的语法（缺少parens和double $）。所以：

while ($row9 = mysql_fetch_array($result9))
{
  $amount = $row9['amount'];
  if ($amount == 0)
  { 
    echo "<b>Balance: &#8364;00.00</b>";
  }
  else
  {
    echo "<b>Balance: $amount</b>";
  }
}

Answer 2

您要向$添加额外$amount，请尝试以下操作：

if ($amount == 0) {
   echo "<b>Balance: &#8364;00.00</b>";
} else {
  echo "<b>Balance: $amount</b>";
}

事实上，你可以使你的代码更具可读性/标准：

if ($amount == 0)
{
  echo "<b>Balance: &#8364;00.00</b>";
}
else
{
  echo "<b>Balance: $amount</b>";
}

Answer 3

我在while循环中移动了if语句，清理了代码并删除了最后一行的额外$符号。

while ($row9 = mysql_fetch_array($result9)) {
    if ($row9['amount']) == 0 {
        echo "<b>Balance: &#8364;00.00</b>";
    } else {
        echo "<b>Balance: $row9['amount']</b>";
    }    
}

如果变量为空，则为PHP echo text

3 个答案: