php - using exec to append data to file not in current directory -

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i trying set little script allow php append data file

the file etc/httpd/conf/httpd.conf

i want to automatically add data file vhost use...

echo shell_exec('echo "hello" >> /etc/httpd/conf/httpd.conf');

the code not working, , not outputting anything

i have feeling due working directory,

i welcome other ways of doing this... must able called via php window

probably it's permission problem. permissions on httpd.conf? can check using ls -l /etc/httpd/conf/httpd.conf if you're on linux/mac.


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