Question

好的，所以我找不到任何可以帮我解决这个问题的事情

$hvorerjeg = $db->query("SELECT * 
    FROM `ts` 
    WHERE `aktiv` = '1' 
      AND `player1` = '$obj->id' 
      OR `player2` = '$obj->id' 
      OR `player3` = '$obj->id' 
      OR `player4` = '$obj->id'"); 
//Checks if user is player1 or player2 or player3 or player4

我想检查用户是播放器1，播放器2，播放器3还是播放器4的代码但是这个dosnt对我有用，我现在找了一个半小时的答案现在但我无法解决它。对不起，如果它是一个非常容易的事情，但我非常新的PHP

Answer 1

在SQL中，AND运算符优先于OR运算符。

$hvorerjeg = $db->query("SELECT * FROM `ts` WHERE `aktiv` = '1'
  AND (
  `player1` = '$obj->id' OR
  `player2` = '$obj->id' OR
  `player3` = '$obj->id' OR
  `player4` = '$obj->id')
");

作为旁注，此代码易受sql注入攻击。使用预准备语句来使代码更安全。

Answer 2

尝试对OR进行分组，因为如果1返回true，则它们的组将返回true。

$hvorerjeg = $db->query(
    "SELECT * FROM `ts` WHERE 
    `aktiv` = '1' AND 
    (
        `player1` = '$obj->id' OR 
        `player2` = '$obj->id' OR 
        `player3` = '$obj->id' OR 
        `player4` = '$obj->id'
    )"
);

Answer 3

试试这个：

$hvorerjeg = $db->query("SELECT * 
    FROM `ts` 
    WHERE aktiv = '1' 
    AND (player1 = '" .  $obj->id . "'" . 
         " OR player2 = '" . $obj->id . "'" . 
         " OR player3 = '" . $obj->id . "'" . 
         " OR player4 = '" . $obj->id . "')");

PHP使用多个OR的mysql查询

3 个答案: