[kh99]

It's kind of tricky selecting hooks just based on the name. Anyway, I would use postbit_display_complete instead of showpost_start.

You don't want to return from your plugin, because that could keep other plugins on the same hook from running. What you want to do is register your variable to the postbit template. Here's an article on rendering templates: https://vborg.vbsupport.ru/showthread.php?t=228078

But your code would be something like:

PHP Code:

global $vbulletin;

$fournisseur = $vbulletin->db->query_first(" 
            SELECT telephone 
            FROM devis_fournisseurs 
WHERE userid=$post[userid]   
");     

vB_Template::preRegister('postbit', array('telephone' => $fournisseur[telephone])); 


You might also want to keep an array of userid => telephone and check that before doing a query, that way you won't have to query the same user more than once. Note that postbit_display_complete is called from inside a function, so you need to use a 'global' statement for any global variables you want to use.