If you need to modify the configuration file of your PHP instance, to a certain extent it is possible to do so.

Some parameters can't be changed. The list of these unmodifiable parameters is below.

Access your instance with SFTP and download the file /lamp0/etc/php/php-custom.ini Locally edit the file. putting in the values you want to change. Values that remain unmodified will remain at the defaults.​​( See default phpinfo). When you are satisfied with your version of the file, upload it to your instance, replacing the original (lamp0/etc/php/php-custom.ini).

To make your changes effective, you need to reboot your instance.

Here is the list of unmodifiable parameters and their default values. Entries in php-custom.ini for one of these settings in your will be ignored:

log_errors = On
ignore_repeated_errors = On
ignore_repeated_source = On

memory_limit = 128
# memory_limit = 256 for a XXL size Simple Hosting
realpath_cache_size = "1M"
memory_limit = 128M
max_execution_time = 120
 
upload_tmp_dir = "/srv/data/tmp"
upload_max_filesize = 128M
post_max_size = 128M

include_path = ".:/usr/share/php:/srv/data/web/includes"
 
variables_order = GPCS

output_buffering = 8192

[apc]
apc.gc_ttl = 1200
apc.ttl = 0
apc.user_ttl = 0
apc.slam_defense = 0
apc.write_lock = 1
apc.file_update_protection = 0
apc.stat = 1
apc.stat_ctime = 1
apc.max_file_size = 10M

[mysql]  
mysql.default_socket="/var/run/mysqld/mysqld.sock" 
mysql.default_user="root"
mysql.default_pw=""

[mysqli]
mysqli.default_socket="/var/run/mysqld/mysqld.sock"
mysqli.default_user="root"
mysqli.default_pw=""

[pdo_mysql]
pdo_mysql.default_socket="/var/run/mysqld/mysqld.sock"