PHP，MYSQL每當一個特定的行擊中其添加+1 PHP變量

Question

這是我目前必須從數據庫中獲取的值

$unread_messages = ""; 

$query = mysql_query("SELECT * FROM pm WHERE msg_to='".$_SESSION['user_id']."' or 
msg_from='".$_SESSION['user_id']."' LIMIT 10") or die(mysql_error()); 
while($row = mysql_fetch_array($query)){ 
$msg_id = $row["msg_id"]; 
$msg_to = $row["msg_to"]; 
$msg_from = $row["msg_from"]; 
$msg_title = $row["msg_title"]; 
$msg_content = $row["msg_content"]; 
$msg_date = $row["msg_date"]; 
$msg_read = $row["msg_read"]; 
} 

現在我需要它，這樣每次「$ msg_read == 1 '它爲'$ unread_messages'增加了+1。有人能幫助我嗎？

Answer 1

$unread_message = 0; 
while($row = mysql_fetch_array($query)) 
{ 
    //Your code 
    if ($msg_read === 1) 
     $unread_message++; 
} 

Answer 2

只需添加一個檢查在循環

$unread_messages = 0; 

while (...) { 
    // do stuff 
    if ($msg_read == 1) { 
     $unread_messages++; 
    } 
} 

---

我強烈建議你看看在mysqli或PDO擴展數據庫的訪問。 mysql_已過時，不應使用。

Answer 3

你試過這個嗎？

$unread_messages = ""; 

$query = mysql_query("SELECT * FROM pm WHERE msg_to='".$_SESSION['user_id']."' or 
msg_from='".$_SESSION['user_id']."' LIMIT 10") or die(mysql_error()); 
while($row = mysql_fetch_array($query)){ 
$msg_id = $row["msg_id"]; 
$msg_to = $row["msg_to"]; 
$msg_from = $row["msg_from"]; 
$msg_title = $row["msg_title"]; 
$msg_content = $row["msg_content"]; 
$msg_date = $row["msg_date"]; 
$unread_messages = ($row["msg_read"]==1 && $unread_messages=='') ? $unread_messages=1 : $unread_messages=$unread_messages+1; 
} 

喔，對不起，使用PDO actualy真的好做法，可能是你可以試試這個

$unread_messages = ""; 
try { 
    $dbh = new PDO("mysql:host=$hostname;dbname=dbname", $username, $password); 
    $sql = "SELECT * FROM pm WHERE msg_to='".$_SESSION['user_id']."' or msg_from='".$_SESSION['user_id']."' LIMIT 10"; 
    foreach ($dbh->query($sql) as $row){ 
     $unread_messages = ($row["msg_read"]==1 && $unread_messages=='') ? $unread_messages=1 : $unread_messages=$unread_messages+1; 
    } 
    $dbh = null; 
} 
catch(PDOException $e){ 
    echo $e->getMessage(); 
}