计数器在PHP/MySQL中不会增加

Question

我需要为成员部分创建一个计数器(计算用户记录的次数).

我有以下脚本(counter.php):

<?php
    $conn = mysql_connect("localhost", "myuser", "mypass");
    mysql_select_db("test");

    $sql = "SELECT views FROM members WHERE mid = " . $_GET['mid'];     
    $result = mysql_query($sql); 
    if (!$result)
        {
        mail(ADMIN, 'Cannot Get: ' . mysql_error(), mysql_error());  
        }
    while ($row = mysql_fetch_assoc($result)) 
        {
        $count = $row['views']++; 
        }
    $query = "UPDATE members SET views = '$count' WHERE mid = " . $_GET['mid']; 
    mysql_query($query); 
    mysql_close($conn);

    // show the logo using header() and readfile(); // that part work
?>

D B:

CREATE TABLE `members` (
  `mid` int(11) NOT NULL AUTO_INCREMENT,
  `views` int(11) DEFAULT '0',
  /* etc...*/
  PRIMARY KEY (`mid`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

现在,我在.htaccess文件中所做的是:

RewriteEngine On
RewriteRule ^img/logo([0-9]+).jpg$ /counter.php?mid=$1 [L]

但由于某种原因,我的计数器不正确.我错过了什么？

Answer 1

你可能只是简化它并执行以下操作:

$query = "UPDATE members SET views = views + 1 WHERE mid = " . $_GET['mid']; 
mysql_query($query); 

if (mysql_affected_rows() == 0) {
   mail(ADMIN, 'Cannot Get: ' . mysql_error(), mysql_error());
}

mysql_close($conn);

无需进行初步检查.

Answer 2

用这个

$count = $row['views'] + 1;

要么

$count = ++$row['views'];

要么

$query = "UPDATE members SET views = views + 1 WHERE mid = " . $_GET['mid'];

句法:

$x = 1;
$count = $x++;
// $count = 1

$x = 1;
$count = ++$x;
// $count = 2