In the template development of Anqi CMS,splitA filter is a very practical tool that can help us break down complex string data into an array that is easier to process. When we are faced with strings that contain a mix of Chinese, English, or numbers, how can we ensure thatsplitThe filter works correctly without any errors, especially in terms of character encoding, which is a concern for many users.

splitOverview of the working principle of the filter

splitThe filter is mainly used to split a string into an array according to a specified delimiter. For example, if there is a string"apple,banana,orange", using a comma as the delimiter,splitit will be split into["apple", "banana", "orange"]Such an array. This feature is very common and convenient in scenarios such as tag lists, keyword strings, etc.

The core points of character encoding processing

When usingsplitWhen the filter handles strings containing a mix of Chinese, English, or numbers, character encoding issues are indeed a key concern for developers.AnQiCMS is a system developed based on the Go language, whose underlying default string handling is UTF-8 encoding.splitThe filter usually maintains the integrity and correctness of characters when cutting Chinese, English, or numbers, without the need for additional encoding conversion operations.

For example, a mixed string"安企CMS,Version 3.0,2023"If the delimiter is an English comma,splitthe filter will recognize it and split it correctly,["安企CMS", "Version 3.0", "2023"]. Each Chinese, English, or numeric character is considered a complete character unit.

However, in certain specific situations, we need a deeper understanding ofsplitthe behavior of the filter:

  1. When the delimiter is an empty string,obj|split:""):It is worth noting that whensplitThe filter is called with no delimiter (i.e., the delimiter is an empty string)""). In this case, it splits the string at each UTF-8 character. For example, the string"你好"Without delimiters, it will be split into["你", "好"]. This behavior is very useful for precisely processing multilingual strings by characters, similar tomake_listthe function of the filter,make_listThe string is also split into an array of characters.

  2. When the delimiter does not exist in the string:If the specified delimiter does not exist in the original string,splitThe filter will return an array containing only the original string itself, with a length of 1. For example, for"Hello World"using a delimiter"---"performingsplitan operation, the result will be["Hello World"].

points to note in actual operations

Although the AnQiCMSsplitThe filter performs well under UTF-8 environment, but there are still a few points to note in practical application:

  • Ensure the source string encoding is consistent:AnQiCMS requires template files to use UTF-8 encoding. If your string data comes from a database, external API, or manual input, please make sure these data sources are also in UTF-8 encoding. If the string itself input into the filter is not encoded correctly (such as being in GBK or another encoding), then evensplitThe filter itself is working normally, it may also be due to encoding mismatch that results in garbled or inaccurate cutting.
  • Choose a clear and explicit delimiter:When dealing with mixed-language strings, the choice of separator is particularly important.It is recommended to use characters or strings that are not commonly found in the content and are explicit as delimiters to avoid the delimiters themselves being incorrectly cut as part of the content.
  • ProcesssplitThe resulting array: splitThe filter converts the string into an array and usually needs to be配合forcycled to traverse, or usejoinThe filter reassembles the array into a new string. Continue to pay attention to character encoding in these subsequent operations to ensure the correctness of the final output.

In summary, AnQiCMS'ssplitThe filter performs stably and efficiently when processing mixed-language strings, and its core lies in the excellent support of UTF-8 encoding in the Go language.As long as we ensure the UTF-8 encoding correctness of the source string, choose a delimiter reasonably, and understand its special handling behavior, we can effectively utilize this tool to meet various needs of content operation and template development.

Common Questions (FAQ)

  1. Question: If my string data is in GBK encoding,splitCan the filter correctly split Chinese characters? Answer:Cannot. AnQiCMS and its template engine are default UTF-8 encoding environment. If your source string is GBK encoding, directly pass itsplitThe filter may cause the cutting result to appear garbled or inaccurate.Before introducing data into AnQiCMS, it is recommended that you first convert the GBK encoded string to UTF-8 encoding.

  2. Q:splitfilters andmake_listWhat are the differences in function between filters? Answer:When the delimiter is an empty string, splitfilters andmake_listThe behavior of filters is very similar, they will split strings into arrays by each UTF-8 character. Butmake_listThe filter is specifically designed for this purpose, it is more focused on treating strings as character sequences for operations, whilesplitThe filter is more general, mainly used for splitting based on the specified delimiter. Both can be used when splitting by individual characters are needed, butmake_listit may be more intuitive to express the intention.

  3. Q:splitThe array elements obtained later, if further processing is needed, such as removing leading and trailing spaces, what should be done? Answer: splitThe filter will split the string into the original array, with each element potentially containing leading and trailing spaces. If you need to remove these spaces, you can use them in combination while iterating through the array.trimfilter. For example:

    {% set tags_string = "  tag1 , tag2 ,tag3  " %}
{% set tag_list = tags_string|split:"," %}
{% for tag in tag_list %}
    <li>{{ tag|trim }}</li>
{% endfor %}

    This is," tag1 "filtertrimProcessed to"tag1".