php 未定义偏移：1
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Undefined offset: 1
提问by user653480
In my current PHP script this error comes up: Undefined offset: 1
在我当前的 PHP 脚本中出现此错误：未定义偏移：1
My code is here:
我的代码在这里：
$query = "SELECT item_id, username, item_content FROM updates ORDER BY update_time DESC LIMIT " . $start . ", " . $number_of_posts;
$result = mysql_query($query) or die(mysql_error());
while($row = mysql_fetch_assoc($result)) {
preg_match("/<p>(.*)<\/p>/",$row['item_content'],$matches);
$row['item_content'] = strip_tags($matches[1]);
$posts[] = $row;
}
If you see whats causing this, posting below would really help. Thanks! :)
如果您看到导致这种情况的原因，则在下面发布确实会有所帮助。谢谢！:)
回答by Frosty Z
Instead of
代替
$row['item_content'] = strip_tags($matches[1]);
Try
尝试
if (isset($matches[0]) && isset($matches[0][1]))
$row['item_content'] = strip_tags($matches[0][1]);
else
$row['item_content'] = '';
回答by Naftali aka Neal
the error is on this line:
错误在这一行：
$row['item_content'] = strip_tags($matches[1]);
回答by Dhaivat Pandya
As Neal said, there is a problem on that line. It seems that $matches[1] is undefined (i.e. there are no mathces, or there is only 1 match, $matches[0]). Make sure your table is working correctly.
正如尼尔所说，那条线上有问题。似乎 $matches[1] 是未定义的（即没有 mathces，或者只有 1 个匹配，$matches[0]）。确保您的桌子工作正常。
