For your php variables. 

You can create a php.ini file and put it in the /administrator of joomla.

content example php.ini : 

max_input_vars = 4000
upload_max_filesize = 45M
post_max_size = 45M
memory_limit = 46M
upload_tmp_dir = 45M
max_execution_time = 180
max_file_uploads=50
upload_tmp_dir = /homepages/your directory/tmp

G.Bob

Pour vos différentes variables php. 

Vous pouvez créer un fichier php.ini et le mettre dans le répertoire /administrator de joomla.

contenu exemple php.ini :

max_input_vars = 4000
upload_max_filesize = 45M
post_max_size = 45M
memory_limit = 46M
upload_tmp_dir = 45M
max_execution_time = 180
max_file_uploads=50
upload_tmp_dir = /homepages/your directory/tmp

G.Bob