Question

我正在开展一个项目，我需要计算每个特定帖子的评论总数，并在逗号分隔的字符串中打印评论者ID。以下是我如何获取评论者的ID并计算评论

$commenters=mysql_query("select session_id from comments where onid='theid'");
$noof_comments=mysql_num_rows($commenters); //counting the comments working good
$forprintingid=mysql_fetch_array($commenters);/* now I know this array stores all the
 session ids of commenters and I can print them by using while loop but 
   here I do not want to use any loops ..*/

输出可能看起来像

 total comments =$noof_comments // total comments=13
 commenters id= // it should be like 1,2,3,4,5,6,

如果重复任何id，只需使用一次。请帮我。我被困在这里可能是内爆了功能可能会有所帮助，但我不知道究竟是多少...... :(

Answer 1

您可以在GROUP_CONCAT中查看MySQL函数，而不是在PHP中完全执行此操作，它会根据需要提供逗号分隔的字段值。

SELECT GROUP_CONCAT(field_name) FROM table_name...

Answer 2

$commenters=mysql_query("select session_id from comments where onid='theid'");
$noof_comments=mysql_num_rows($commenters); //counting the comments working good
while($row=mysql_fetch_array($commenters))
$forprintingid[]=$row[0];

echo implode(',', $forprintingid); //it shoul be like 1,2,3,4,5,6,

Answer 3

$r = array(); while($x = mysql_fetch_assoc($commenters)) $r[] = $x; $forprintingid = implode(",",$x);

一行代码:) 编辑这仍然算作一行吗？

Answer 4

无论你需要循环什么。此外，您只需要数字索引或关联数组。

您可以创建一个功能：

function mysql_fetch_all($result, $result_type = MYSQL_ASSOC) {
    while($rows[] = mysql_fetch_array($result, $result_type)) {} return $rows;
}

然后在结果数组上使用implode()：

$forprintingid = implode(',', mysql_fetch_all($commenters));

使用mysql_fetch_array打印逗号分隔的字符串和mysql_num来计算

4 个答案: