memory_limit should not be interpreted as an integer.

[Jean-Daniel]

When using php FPM, the memory limit defaults to 128M causing the following warning on the login page:

Your php memory limit is low - currently 128M, you should increase it to atleast 24. This is normally controlled in /etc/php.ini

php ldap admin should either stop trying to tell me what the good limit should be, or properly interpret the php memory limit setting instead of assuming the limit is an integer representing the number of bytes.