how to change PHP "memory_limit" value for one cpanel user or one just directory / its subdirectories? (as a WHM server admin)

i have php, suexec, suhosin

I tried to add "suhosin.memory_limit 128M" and "suhosin.memory_limit 128" into php.ini in that script directory and after reloading phpinfo(), still same limit.. (64M)

// Update: i think i found it, but not sure if its the best solution. Adding into global php.ini (in my case: /usr/local/lib/php.ini) this at the very end of file:

memory_limit = 128M
PS i also listen about "suhosin.memory_limit 64"