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how to solve "backquotes"  problem for shell_exec():

Last Modified: 2012-08-13
I use script php shell for make some action and in this php file I use function shell_exec():
but this create error :
Warning: shell_exec(): Cannot execute using backquotes in Safe Mode in /root/mail_check.php on line 68

but see this part of my conf php :
safe_mode = Off
safe_mode_gid = Off
; safe_mode_include_dir = /data/www/generated
; safe_mode_exec_dir = /data/www/bin
; safe_mode_allowed_env_vars = PHP_
; safe_mode_protected_env_vars = LD_LIBRARY_PATH

safe mode is Off

and line woth probleme in php script is :
        $commande="/root/qmHandle -D";                 //line 67
        $result=shell_exec($commande);                 //line 68
        echo $result;                                                  //line 69

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