Hello.
Sorry for my English!
I built a componennt, it runs fine on Sanbox but when I download and install it on my website it does not work with this error message:
Fatal error: Call to undefined function json_encode() in /mnt/137/sdc/b/d/s.bordas/administrator/components/com_supervision/dom/dom.php on line 342
The component is very simply: one table with 3 fields, one backend collection (for data grid) and one backend item (for form). The error is generated after datagrid new versus form.

json_encode() is a native PHP function.

You need PHP 5.


php.net/manual/fr/function.json-encode.php

Sorry!
This topic is not solved because my site is under php 5.
Joomla configuration:
"
PHP exécuté sur: Linux phpn6-g5.priv.free.fr
Version de la base de données: 5.0.83
Collation de la base de données (dépend du jeu de caractères): utf8_general_ci
Version de PHP: 5.1.3RC4-dev
Serveur Web: Apache/ProXad [Aug 9 2008 02:45:12]
Du serveur Web à l'interface PHP: cgi-fcgi
Version de Joomla!: Joomla! 1.5.24 Stable [ senu takaa ama naiki ] 17-October-2011 18:00 GMT
Navigateur: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1
"
A another idea?

Excuse me.

Can you try you json_function() alone, please ?

I found
I have re-upload dom folder in administrator folder. It was success.
Maybe a problem in install compilation?

We constantly modify the source codes everwhere, even in JDOM.
When you regenerate your component, it is important to reuse ALL files.

Maybe it is not your problem, but I precise for others, that we can't be responsibilized if you split your component and add some parts (coming from Cook too) afterwards.