Php error_logs not writing in ftp directory

Hi
How do i setup php error logs for to print all error in single account ftp directory ? when i login to ftp account i only see few folder, i dont see logs folder
please help me to setup this in cwp pro.

my php ini settings are correct, i i setup the  error_log:    /var/www/log/php_errors.log

still not creating log folder in ftp directory !
please help me to fix this problem.

php in cwp is per user and now allowed to exit home folder of the user

thanks for replying me back, but how can we make it? for example in cpanel whm it creates log folder in home directory automaticly. how can we make in cwp ? any suggest ?

What exactly folder do you want using for logs? you cannot use /var/www/a_path/