Title: Please explain DOI hyperlinking
Last modified: February 11, 2025
---
# Please explain DOI hyperlinking
* [Jim](https://wordpress.org/support/users/jwmc/)
* (@jwmc)
* [1 year, 3 months ago](https://wordpress.org/support/topic/please-explain-doi-hyperlinking/)
* I don’t understand how DOI hyperlinking is supposed to work. I have a custom
csl style that simply inserts the DOI variable between < and > (as ampersand
codes). When I copy the item out of Zotero (desktop app) as a bibliography and
paste it into a document, the actual DOI is hyperlinked and it works:
* Crous PW, Summerell BA, Carnegie AJ, Wingfield MJ, Hunter GC, Burgess TI, Andjic
V, Barber PA, Groenewald JZ. 2009. Unravelling Mycosphaerella: do you
believe in genera? Pers – Int Mycol J 23(1):99–118 <[10.3767/003158509X479487](https://doi.org/10.3767/003158509X479487)
>.
* In Zotpress, the same style results in printing the same, correct text, but with
no hyperlink:
* Crous PW, Summerell BA, Carnegie AJ, Wingfield MJ, Hunter GC, Burgess TI, Andjic
V, Barber PA, Groenewald JZ. 2009. Unravelling Mycosphaerella: do you
believe in genera? Pers – Int Mycol J 23(1):99–118 <10.3767/003158509X479487>.
* What am I missing?
Viewing 2 replies - 1 through 2 (of 2 total)
* Thread Starter [Jim](https://wordpress.org/support/users/jwmc/)
* (@jwmc)
* [1 year, 3 months ago](https://wordpress.org/support/topic/please-explain-doi-hyperlinking/#post-18300198)
* Update: as a test, I updated the style without the < and > around the DOI variable.
Getting Zotpress to see the update was quite a struggle. Part of it involved
emptying the account cache on Zotpress > Accounts. Anyway, it made no difference.
* Thread Starter [Jim](https://wordpress.org/support/users/jwmc/)
* (@jwmc)
* [1 year, 3 months ago](https://wordpress.org/support/topic/please-explain-doi-hyperlinking/#post-18309152)
* Katie, I’ve gotten to the bottom of this, and I would like to suggest a change
to `shortcode.request.php`, the section `// Hyperlink DOIs`, beginning line 664.
The change is shorter than the original, covers more cases, and causes ZP to
behave more like Zotero. When the style presents a DOI variable, there are really
just two basic cases: a) we create a hyperlink that only shows the DOI itself(
for styles that use ‘doi:’, ‘doi: ‘, or only the bare DOI), or b) a hyperlink
that shows the link text as well ([https://doi.org/](https://doi.org/)). In the
latter case, if the style presents [http://doi.org/](http://doi.org/), I see
no reason why ZP shouldn’t output https anyway, but maybe there is a reason.
* Here is the suggested code:
* ```wp-block-code
// Hyperlink DOIs if ( isset($item->data->DOI) // && $item->data->DOI !== null && strlen($item->data->DOI) > 0 ) { // Styles without link text + if ( strpos( $item->bib, "doi.org" ) == false ) { $item->bib = str_ireplace( $item->data->DOI, "".$item->data->DOI."", $item->bib ); } // Styles with http or https elseif ( strpos( $item->bib, "doi.org/" ) !== false && strpos( $item->bib, "" ) == false ) { $item->bib = preg_replace( "#https?://doi.org/\S+#i", "https://doi.org/".$item->data->DOI."", $item->bib ); } }
```
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* 2 replies
* 1 participant
* Last reply from: [Jim](https://wordpress.org/support/users/jwmc/)
* Last activity: [1 year, 3 months ago](https://wordpress.org/support/topic/please-explain-doi-hyperlinking/#post-18309152)
* Status: not resolved