مشکل Fatal error: Call to undefined function mb_substr() in /home/info/public_html/in

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http://www.dzbatna.com/images/icons/iconrote.gif ظ…ط´ع©ظ„ Fatal error: Call to undefined function mb_substr() in /home/info/public_html/in (http://www.dzbatna.com/t1699455/)