Dolibarr is unable to encrypt the database password as recommended

[JOduMonT]

In the dolibarr dashboard, under Setup -> Security -> Password

at the bottom of the page, under Parameters
if I activate the Encrypt database password stored in php.INI, which is strongly recommended to activate this option
Dolibarr stop working.

My impression is Dolibarr don't have access or the right to write into the php.ini file.