create /var/www/vhosts/$DOMAIN$/conf/vhost.conf
content:
<DIRECTORY /var/www/vhosts/$DOMAIN$/httpdocs>
<IfModule sapi_apache2.c>
php_admin_flag engine on
# General settings
php_admin_flag safe_mode off
php_admin_value open_basedir "/var/www/vhosts/$DOMAIN$/:/tmp/"
# Performance settings (not mandatory)
php_admin_value memory_limit 512M
php_admin_value max_execution_time 600
php_admin_value max_input_time 300
php_admin_value post_max_size 60M
php_admin_value upload_max_filesize 60M
# Additional directives
</IfModule>
</DIRECTORY>
<DIRECTORY /var/www/vhosts/$DOMAIN$/httpdocs>
<IfModule mod_php5.c>
php_admin_flag engine on
# General settings
php_admin_flag safe_mode off
php_admin_value open_basedir "/var/www/vhosts/$DOMAIN$/:/tmp/"
# Performance settings
php_admin_value memory_limit 512M
php_admin_value max_execution_time 600
php_admin_value max_input_time 300
php_admin_value post_max_size 60M
php_admin_value upload_max_filesize 60M
# Additional directives
AddHandler php5-script .hph
AddType text/html .hph
</IfModule>
</DIRECTORY>
/usr/local/psa/admin/sbin/httpdmng --reconfigure-domain $DOMAIN$
and voila..