XF 1.4 How do I add strings in a foreach loop?

[Stuart Wright]

Folks I have the following code on a page which displays tags (for some content) over the top-left corner of an image.
E.g. https://www.avforums.com/review/panasonic-tx-50cx802b-cx802-cx800-4k-review.11261

<xen:foreach loop="$tags" value="$tag">
 <xen:if is="{$tag.tag_name}"><span><a href="{xen:link 'tag', $tag}">{$tag.tag_name}</a></span><br /></xen:if>
</xen:foreach>

I want to create an additional string variable which is a comma separated list of the tags.
How would I do this within the above loop please?
Thanks

 

[SneakyDave]

Do you want to take your existing foreach loop, and create a comma separate list? That's what it sounds like... This will do that, but you'll end up with a comma after the last tag.

<span>
<xen:foreach loop="$tags" value="$tag">
<a href="{xen:link 'tag', $tag}">{$tag.tag_name}</a>,
</xen:foreach>
</span>

If you want to do it within the above foreach loop, then I'm not sure you can easily do it in a template, because explode() and in_array() functions aren't available to templates, IIRC.

 

[Stuart Wright]

Thanks Dave.
What I need to do is build a string variable in the loop that I can then use outside of it.
E.g.

$taglist=""
<xen:foreach loop="$tags" value="$tag">
  <xen:if is="{$tag.tag_name}">$taglist .= {$tag.tag_name} . ","</xen:if>
</xen:foreach>

and then, as you say, truncate the ending comma of $taglist so I can then

<meta property="tags" content="{$taglist}">

Possible?

 

[SneakyDave]

I don't think it is within a template. You'd need to probably need access to the implode() function, which I don't think you can use in templates.

It would look something like this, if it was supported in templates.

$comma_delimited_tags = implode(",",$tags);

 

[Chris D]

This is untested:

<xen:set var="$tagList" value="" />
<xen:foreach loop="$tags" value="$tag">
    <xen:if is="{$tag.tag_name}">
        <xen:set var="$tagList" value="{$tagList}, {$tag.tag_name}" />
    </xen:if>
</xen:foreach>

 

[Chris D]

Incidentally, you can use implode in templates. Search templates to see the syntax of that. Though you would need an array of tag names rather than an array of tag arrays which it seems you have now.

 

[Chris D]

I've actually had a chance to test this properly, now. It works fine, however there's a small change which removes superfluous commas:

<xen:set var="$tagList" value="" />

<xen:foreach loop="$tags" value="$tag">
    <xen:if is="{$tag.tag_name}">
        <xen:set var="$tagList" value="{xen:if '{$tagList}', '{$tagList}, '}{$tag.tag_name}" />
    </xen:if>
</xen:foreach>

 

[Stuart Wright]

I've actually had a chance to test this properly, now. It works fine, however there's a small change which removes superfluous commas:

Thank you, Chris, that's brilliant.
And for anyone wanting to see, it's working in this page:
https://www.avforums.com/review/panasonic-tx-50cx802b-cx802-cx800-4k-review.11261
View source and search for

<meta property="keywords"

And is showing with the structured data (rich snippet) being validated here:
https://developers.google.com/struc...sonic-tx-50cx802b-cx802-cx800-4k-review.11261
Hopefully this will get Google to present our reviews in a more useful way in its search results.

 

[Robert9]

I have to save integers, maybe pairs of ints and strings to one field.
Is there a change to work with them directly in the template?
Example:
"1,23,233" or
"1,cars,2,dogs,3,cats"

Somehow i need an array to say

<xen:foreach loop="$field" value="$value" key=$key>
This is the $key and the $value<br>
</xen:foreach>

I can save the data in any way, but i want to work with this value directly in the template.
What can i do, please?