PHP是否大于（条件）不能正常工作？

Question

首先，我有一个名为trade_field的表

+-----------+----------------+------------------+--------------+
| UID       | durabletime    | productionQTY    | timestamp    |
+-----------+----------------+------------------+--------------+
| 88        | 1234           | 6.00             |1444400000    |
----------------------------------------------------------------

然后我查询mysql并分配像这样：

$queryCopper = mysql_query("SELECT * FROM trade_field WHERE uid = ".$uid." AND fid = ".$fid."");

while($row = mysql_fetch_row($queryCopper)) {
    $idCopper[] = $row['id'];
    $timenow = time();
    $durabletime = $row['durabletime'];
    $Copperpdt = $row['production'];
    $CopperQTY = number_format(($timenow - $row['timestamp']) / 60 * $Copperpdt);

    if ($CopperQTY > $durabletime || ($CopperQTY > 1000 && $durabletime < 1000)) {
        $CopperQTY = $durabletime;
    } elseif($CopperQTY > 1000 && $durabletime > 1000) {
        $CopperQTY = 1000;
    } elseif($CopperQTY < 1000 && $CopperQTY < $durabletime) {
        $CopperQTY = number_format(($timenow - $row['timestamp']) / 60 * $Copperpdt);
    } else {
        echo "Error";
    };

    $user_list_Copper[] = $row;
}

所以现在我们将timenow = 1444450000设置timenow = 1444450000因此$CopperQTY = 5000 （因为number_format(($1444450000 - 1444400000) / 60 * 6.00); ）

一般情况是：

if $CopperQTY > $durabletime
    then $durabletime = $CopperQTY

之后，

if ($CopperQTY < 1000 && $CopperQTY > $durabletime)
    then $durabletime = $CopperQTY

之后，

if $durabletime > $CopperQTY
    then $CopperQTY = $CopperQTY

之后，

if ($durabletime > $CopperQTY && $CopperQTY > 1000)
    then $CopperQTY = 1000

但是当我运行上面的代码时，系统显示$CopperQTY = 5000 。

Answer 1

根据您所说的条件， if-else-if-else语句应如下所示：

if ($CopperQTY > $durabletime) {

    $durabletime = $CopperQTY

} else if ($CopperQTY < 1000 && $CopperQTY > $durabletime) {

    $durabletime = $CopperQTY

} else if ($durabletime > $CopperQTY) {

    $CopperQTY = $CopperQTY

} else if ($durabletime > $CopperQTY && $CopperQTY > 1000) {

    $CopperQTY = 1000

} else {
    echo "Error";
}

由于$CopperQTY = 5000和$durabletime = 1234因此$durabletime将等于5000 ，并且if语句将中断。