I suggest a way to automatically change the font based on the user's profile.

Referred to my own idea: http://www.zabbix.com/forum/showthread.php?t=22148&page=2, this approach can automatically change font just by using soft links to the font files and the locale names as the names of the soft links:

First, I added a function setFontnames() into the file include/locales.inc.php as followed.

function setFontnames()

{ global $USER_DETAILS; $ZBX_FONT_NAME = $USER_DETAILS['lang']; $ZBX_GRAPH_FONT_NAME = $USER_DETAILS['lang']; }

In the directory fonts, I added some Unicode fonts and added soft links:
i.e.
$ ln -s DejaVuSans.ttf en_GB.ttf
$ ln -s bsmi00lp.ttf zh_CN.ttf
$ ln -s uming.ttc zh_TW.ttf
....

Finally, I called setFontnames() in the file include/graphs.inc.php at the beginning of each of the following functions:

function imageText($image, $fontsize, $angle, $x, $y, $color, $string)

{ setFontnames(); ... }

function imageTextSize($fontsize, $angle, $string){ setFontnames(); ... }

Instead of the final step, it would be better to change the font name whenever a user's language has been changed.