Question

我基本上是在尝试将这两个if语句合并为一个。如果两个或两个陈述均正确，我希望能够发送邮件，否则不要发送。

我的搜索>>

$search1 = mysqli_query($link, "SELECT * FROM NND where dname like 'EXP%' and Bl = 1 ");
$search2 = mysqli_query($link, "SELECT * FROM NND where dname like 'EXP%' and Bl = 0");

$lb = $search1->num_rows;
$db = $search2->num_rows;

如果是我的

    if (mysqli_num_rows($search1) == 0) {
    echo ("There is nothing to send");
} else {
    (mail ($to, $subject, $message, $headers));
}

    if (mysqli_num_rows($search2) == 0) {
    echo ("There is nothing to send");
} else {
    (mail ($to, $subject, $message, $headers));
}

谢谢大家的光临

Answer 1

这是另一个变体，它使用来自两个查询的行计数之和：

if (mysqli_num_rows($search1) + mysqli_num_rows($search2) == 0) {
    echo ("There is nothing to send");
}
else {
    (mail ($to, $subject, $message, $headers));
}

但是我认为更好的方法是改为运行单个MySQL查询：

SELECT *,
    CASE WHEN dname Bl = 1 THEN 1 ELSE 2 END AS search  -- keep track of result set
FROM NND
WHERE
    dname LIKE 'EXP%' AND Bl = IN (0, 1);

然后，您可以只检查单个查询的总行数来做出决定。请注意，从延迟的角度来看，这种方法也很有吸引力，因为它只需要单次往返数据库。

Answer 2

使用此代码：-

if (mysqli_num_rows($search1) == 0 && mysqli_num_rows($search2) == 0) {
    echo ("There is nothing to send");
} else {
    (mail ($to, $subject, $message, $headers));
}

Answer 3

使用：

  if (mysqli_num_rows($search1) != 0 || mysqli_num_rows($search2) != 0) {
    (mail ($to, $subject, $message, $headers));    
   } else {
        echo ("There is nothing to send");
   }

或者您可以使用@rawathemant所说的话：

if (mysqli_num_rows($search1) == 0 && mysqli_num_rows($search2) == 0) {
    echo ("There is nothing to send");
   } else {
        (mail ($to, $subject, $message, $headers));    
   }

根据德=摩根定律：-）

合并if语句

3 个答案: