Question

我想知道如何缩短从mysql数据库生成的文本。我尝试按照我在互联网上找到的一些教程但是失败了。

这是我的代码，

<?php 
$dbh=mysql_connect("localhost","root","root") or die ('Cannot connedt to the Database' .mysql_errno()); 
mysql_select_db("myinfo_db"); 

$res_query = mysql_query("SELECT A.cat_id as cat_id, count(A.cat_id) as cnt, B.category as category FROM listings A, category B WHERE A.cat_id=B.cat_id GROUP BY A.cat_id");

while ($category = mysql_fetch_assoc($res_query) )
{
    echo '<a href="page.php?cat_id='.$category['cat_id'].'">'.$category['category'].' ('.$category['cnt'].')</a><br />';
}

?>

Answer 1

$res_query = mysql_query("SELECT A.cat_id as cat_id, count(A.cat_id) as cnt, B.category as category FROM listings A, category B WHERE A.cat_id=B.cat_id GROUP BY A.cat_id");

到

 $res_query = mysql_query("SELECT A.cat_id as cat_id, count(A.cat_id) as cnt, B.category as category FROM listings A LEFT OUTER JOIN category B ON A.cat_id=B.cat_id GROUP BY A.cat_id");

显示你的comit限制

function limitContent($content,$number) {
 if(strlen($content)<=$number) { 
   $contents=$content;  
 } else {
   $contents=substr($content,0,$number) . '...';
 }
  echo $contents;
}

PHP

limitContent($category['category'],'10');

Answer 2

如果我正确理解你的问题，你可以使用MySQL子串函数：

http://dev.mysql.com/doc/refman/5.0/en/string-functions.html

SELECT CONCAT(SUBSTRING(sometext,1,10), '...')
FROM sometable;

其中1是起始位置，10是字符数。

这样你就可以直接做到，而且你不需要php来做。在你的情况下像：

SELECT A.cat_id as cat_id, count(A.cat_id) as cnt, CONCAT(SUBSTRING(B.category,1,10), '...') as category FROM listings A, category B WHERE A.cat_id=B.cat_id GROUP BY A.cat_id

Answer 3

我有a little class在单词边界上剪切长文本。因此，在缩短Your ass...时，您不会得到类似Your assignment的内容。

示例：

$f = new EllipsisFilter(15);
echo $f->filter('Lorem ipsum dolor sit amet'); // 'Lorem ipsum…'

随意使用它。

无法缩短php和mysql中的文本

3 个答案: