Example code sharing of how to set the number of words in the summary of the article introduction of Dedecms

This article mainly introduces the article IntroductionAbstractHow to set the number of words. Friends in need can refer to it

dedecms template download address: www.php.cn/xiazai/code/dedecms

In Dedecms In the system, the article abstract (can be called through infolen or description related tags) has a word limit of 250 characters. The main purpose of setting the upper limit is to reduce database redundancy and ensure good website performance. Therefore, it is obviously unreasonable not to set an upper limit on the introduction content, but if this upper limit can be freely controlled, it will have a positive effect on the content layout of the web page. In the process of web design, it is often necessary to call the article summary on the channel list page. If the number of words in the article summary can be effectively controlled, the page layout can be made flexible.

In Dedecms, the main ways to call article abstracts on the list page are:

The code is as follows:

1：[field:info /]
2：[field:description /]
3：[field:info function=”cn_
substr
(@me,字符数)”/]
4：[field:description function=”cn_substr(@me,字符数)”/]

The first and second methods are to directly call article abstracts. When it comes to the number of words to be called, when using [field: info /], you can set the number of characters of the call summary in {dede:arclist infolen=' ' }{/dede:arclist} (the maximum can be set to 250 system settings); if you use [field:description /], Then the upper limit of summary characters set in the background will be used directly. Obviously, these two methods are very passive and have poor sensitivity.

The third and fourth methods realize flexible adjustment of the display characters of the article abstract through functionfunction. Of course, without modifying the character limit of the article abstract, the difference between these four methods is not big. However, let’s talk about how to modify this upper limit below to show the importance of [field:description function=”cn_substr(@me, number of characters)”/].

In Dedecms, the PHP files related to article abstracts mainly include:

The code is as follows:

/dede/archives_add.php
/dede/archives_edit.php
/dede/article_add.php
/dede/article_edit.php
/dede/article_description_main.php

On the add page, there is a sentence: "$description = cn_substrR($description,$cfg_auot_description);", this sentence This completes the function of [field:description function="cn_substr(@me, number of characters)"/]. Since this statement is indeed beneficial to page planning, we did not modify it in the experiment.

On the edit page, there is a sentence: "$description = cn_substrR($description,250);". This sentence shows a familiar number of characters "250", which is the number of characters set by the system for the article summary. Upper limit. If it is gbk encoding, 125 characters will be displayed. If it is UTF-8 encoding, it is 81 characters. Obviously, if we want to break the upper limit on the number of characters in article abstracts, we must use it. Yes, just change "250" here to another value, such as "500". It is not recommended to set it too high here. One is that there is no need to display too much content on the list page (it is better to use the body directly to display too much content), and the other is to avoid redundancy in the database.

Completing the above correction is not enough, you also need to modify article_description_main.php

On the article_description_main.php page, find the "if ($dsize>250) $dsize = 250;" statement, which limits the characters that can automatically obtain the summary in the background number. Just change "250" here to "500", which is the same number of characters as previously modified. (If you confirm that each of your articles is added manually, there is no need to modify this file to manually complete the abstract acquisition. Automatic abstract acquisition is mainly prepared for a large number of articles and collection.)

Finally, log in to the backend, and in the system - System basic parameters - Other options, the automatic summary length can be changed to 500, which is different from the previously modified number of characters.

After completing the above corrections, we can go to the channel list page and call it through the tag. The example tag is as follows:

The code is as follows:

{dede:list typeid=” row=’5′ titlelen=’100′ orderby=’
new
’ pagesize=’5′}
[field:title/]</p>
<p>[field:description function=’cn_substr(@me,500)’/]…
{/dede:list}

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