PHP：For循环只迭代一次

时间：2012-09-24 09:17:34

标签： php mysql function for-loop iteration

我有一个在php游戏中使用的函数，其中有一个for循环检查房间id。基本上，for循环只运行一次，它应该运行两次。下面的代码块说明了（第一个带有$ i的循环）：

// successful sql login & $player is correctly set with '', and all below sql
// statements execute correctly. $count is 2
function setMonstersLocation($player,$rooms_id){
if (mysql_result(mysql_query("SELECT state FROM present WHERE player = $player AND items_id IS NULL AND monsters_id IS NULL AND quantity IS NULL AND rooms_id IS NOT NULL"),0) == 0){
    $sql = mysql_query("SELECT COUNT(*) FROM present WHERE player = $player AND items_id IS NULL AND monsters_id > 100 AND monsters_id < 300");
    $count = mysql_result($sql,0);
    $sql = mysql_query("SELECT monsters_id FROM present WHERE player = $player AND items_id IS NULL AND monsters_id > 100 AND monsters_id < 300 ORDER BY monsters_id");
    for ($i = 0; $i < $count; $i+= 1) {
        $sql = mysql_query("SELECT monsters_id FROM present WHERE player = $player AND items_id IS NULL AND monsters_id > 100 AND monsters_id < 300 ORDER BY monsters_id");
        $result = mysql_result($sql,$i);
        if (mysql_result(mysql_query("SELECT COUNT(*) FROM present WHERE player = $player AND items_id IS NULL AND monsters_id=$result AND quantity = 1"),0) == 1){
            $final = -1;
            $array[1] = $rooms_id - 1;
            $array[2] = $rooms_id + 1;
            $array[3] = $rooms_id - 100;
            $array[4] = $rooms_id + 100;
            $array[5] = $rooms_id - 200;
            $array[6] = $rooms_id - 101;
            $array[7] = $rooms_id - 99;
            $array[8] = $rooms_id - 2;
            $array[9] = $rooms_id + 200;
            $array[10] = $rooms_id + 101;
            $array[11] = $rooms_id + 99;
            $array[12] = $rooms_id + 2;
            if ($result < 200){
                for ($j = 1; $j < 5; $j+=1){
                    $sql = mysql_query("SELECT COUNT(*) FROM present WHERE player = $player AND items_id IS NULL AND monsters_id IS NOT NULL AND rooms_id={$array[$j]}");
                    $count = mysql_result($sql,0);
                    $sql = mysql_query("SELECT COUNT(*) FROM rooms WHERE (rooms_id={$array[$j]})");
                    $roompresent = mysql_result($sql,0);
                    if ($count == 0 and $final == -1 and $roompresent == 1){
                        $final = $array[$j];
                    }
                }
            } else if ($result > 200){
                for ($k = 1; $k < 13; $k+=1){
                    $sql = mysql_query("SELECT COUNT(*) FROM present WHERE (player = $player AND items_id IS NULL AND monsters_id IS NOT NULL AND rooms_id={$array[$k]})");
                    $count = mysql_result($sql,0);
                    $sql = mysql_query("SELECT COUNT(*) FROM rooms WHERE (rooms_id={$array[$k]})");
                    $roompresent = mysql_result($sql,0);
                    if ($count == 0 and $final == -1 and $roompresent == 1){ $final = $array[$k]; }
                }
                if ($final == -1){
                    $sql = mysql_query("SELECT COUNT(*) FROM rooms");
                    $count = mysql_result($sql,0);
                    $sql = mysql_query("SELECT rooms_id FROM rooms");
                    for ($l = 0; $l < $count; $l+=1){
                        $rooms = mysql_query($sql,$l);
                        $sql = mysql_query("SELECT COUNT(*) FROM present WHERE player = $player AND items_id IS NULL AND monsters_id IS NOT NULL AND rooms_id=$rooms");
                        if (mysql_result($sql,0) == 0 and $final == -1){ $final = $rooms; }
                    }
                }
            }
            if ($final != -1){ $sql = mysql_query("UPDATE present SET rooms_id=$final WHERE player = $player AND items_id IS NULL AND monsters_id=$result;"); } 
            else { $sql = mysql_query("UPDATE present SET rooms_id=-1 WHERE player = $player AND items_id IS NULL AND monsters_id=$result");}
        }
    }
    $sql = mysql_query("UPDATE present SET state = 1 WHERE player = $player AND items_id IS NULL AND monsters_id IS NULL AND quantity IS NULL AND rooms_id IS NOT NULL");
} else {
    $sql = mysql_query("UPDATE present SET state = 0 WHERE player = $player AND items_id IS NULL AND monsters_id IS NULL AND quantity IS NULL AND rooms_id IS NOT NULL");
}

}

虽然$ count为2，但for循环只运行一次。每次for循环运行时，我都通过在mysql表中的值中加1来验证这一点。该值仅增加一次。

顶部的if语句是每隔一个时钟运行该函数。

1 个答案:

答案 0 :(得分：2)

for循环的条件部分在循环的每次迭代中进行计算，因此您无法在主循环内更改$count的值。您需要将变量名称更改为更有意义的名称。

试试这个：

// successful sql login & $player is correctly set with '', and all below sql
// statements execute correctly. $count is 2
function setMonstersLocation($player,$rooms_id){
if (mysql_result(mysql_query("SELECT state FROM present WHERE player = $player AND items_id IS NULL AND monsters_id IS NULL AND quantity IS NULL AND rooms_id IS NOT NULL"),0) == 0){
    $sql = mysql_query("SELECT COUNT(*) FROM present WHERE player = $player AND items_id IS NULL AND monsters_id > 100 AND monsters_id < 300");
    // Note here I've changed $count to $playerCount, because it is a count of the
    // number of players.
    $playerCount = mysql_result($sql,0);
    $sql = mysql_query("SELECT monsters_id FROM present WHERE player = $player AND items_id IS NULL AND monsters_id > 100 AND monsters_id < 300 ORDER BY monsters_id");
    for ($i = 0; $i < $playerCount; $i+= 1) {
        $sql = mysql_query("SELECT monsters_id FROM present WHERE player = $player AND items_id IS NULL AND monsters_id > 100 AND monsters_id < 300 ORDER BY monsters_id");
        $result = mysql_result($sql,$i);
        if (mysql_result(mysql_query("SELECT COUNT(*) FROM present WHERE player = $player AND items_id IS NULL AND monsters_id=$result AND quantity = 1"),0) == 1){
            $final = -1;
            $array[1] = $rooms_id - 1;
            $array[2] = $rooms_id + 1;
            $array[3] = $rooms_id - 100;
            $array[4] = $rooms_id + 100;
            $array[5] = $rooms_id - 200;
            $array[6] = $rooms_id - 101;
            $array[7] = $rooms_id - 99;
            $array[8] = $rooms_id - 2;
            $array[9] = $rooms_id + 200;
            $array[10] = $rooms_id + 101;
            $array[11] = $rooms_id + 99;
            $array[12] = $rooms_id + 2;
            if ($result < 200){
                for ($j = 1; $j < 5; $j+=1){
                    $sql = mysql_query("SELECT COUNT(*) FROM present WHERE player = $player AND items_id IS NULL AND monsters_id IS NOT NULL AND rooms_id={$array[$j]}");
                    // Note here I've change $count to $presentCount, because you're
                    // counting the number of presents? (Whatever presents are)
                    $presentCount = mysql_result($sql,0);
                    $sql = mysql_query("SELECT COUNT(*) FROM rooms WHERE (rooms_id={$array[$j]})");
                    $roompresent = mysql_result($sql,0);
                    if ($presentCount == 0 and $final == -1 and $roompresent == 1){
                        $final = $array[$j];
                    }
                }
            } else if ($result > 200){
                for ($k = 1; $k < 13; $k+=1){
                    $sql = mysql_query("SELECT COUNT(*) FROM present WHERE (player = $player AND items_id IS NULL AND monsters_id IS NOT NULL AND rooms_id={$array[$k]})");
                    // You can use $presentCount again here, because it's a 
                    // different code block to the previous one.
                    // This doesn't mean its in a different SCOPE, however.
                    $presentCount = mysql_result($sql,0);
                    $sql = mysql_query("SELECT COUNT(*) FROM rooms WHERE (rooms_id={$array[$k]})");
                    $roompresent = mysql_result($sql,0);
                    if ($presentCount == 0 and $final == -1 and $roompresent == 1){ $final = $array[$k]; }
                }
                if ($final == -1){
                    $sql = mysql_query("SELECT COUNT(*) FROM rooms");
                    // Note here I've change $count to $roomsCount, because you're 
                    // counting the number of rooms.
                    $roomsCount = mysql_result($sql,0);
                    $sql = mysql_query("SELECT rooms_id FROM rooms");
                    for ($l = 0; $l < $roomsCount; $l+=1){
                        $rooms = mysql_query($sql,$l);
                        $sql = mysql_query("SELECT COUNT(*) FROM present WHERE player = $player AND items_id IS NULL AND monsters_id IS NOT NULL AND rooms_id=$rooms");
                        if (mysql_result($sql,0) == 0 and $final == -1){ $final = $rooms; }
                    }
                }
            }
            if ($final != -1){ $sql = mysql_query("UPDATE present SET rooms_id=$final WHERE player = $player AND items_id IS NULL AND monsters_id=$result;"); } 
            else { $sql = mysql_query("UPDATE present SET rooms_id=-1 WHERE player = $player AND items_id IS NULL AND monsters_id=$result");}
        }
    }
    $sql = mysql_query("UPDATE present SET state = 1 WHERE player = $player AND items_id IS NULL AND monsters_id IS NULL AND quantity IS NULL AND rooms_id IS NOT NULL");
} else {
    $sql = mysql_query("UPDATE present SET state = 0 WHERE player = $player AND items_id IS NULL AND monsters_id IS NULL AND quantity IS NULL AND rooms_id IS NOT NULL");
}
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