RESOLVED :
For plesk users you need to make nano .bash_profile when you are in the file add this line :
PATH=/opt/plesk/php/7.1/bin:$PATH
it will work for ssh users !!
for root ssh user you can do :
export PATH=/opt/plesk/php/7.1/bin:$PATH;
Hope it will help
I try to say to composer that now he needs to look on the php version 7.1 wish is installed on my plesk serveur.
how i could do this ? i am not a pro in commands line.. i think i need to add this line
export PATH=/opt/plesk/php/7.1/bin:$PATH;
in my .bashrc
file but i really don't know how to access to this and how to add the line.
hope someone could help me for this, thanks a lot in advance.
Actually i need to do manualy this to update composer :
export PATH=/opt/plesk/php/7.1/bin:$PATH; php composer.phar update