Ho aperto il file php.ini di questo host, sotto la voce
[PHP]
asp_tags = Off
include_path = ".:"
ignore_repeated_source = Off
variables_order = "GPCS"
track_errors = Off
output_buffering = 4096
auto_globals_jit = On
doc_root =
log_errors = On
safe_mode_allowed_env_vars = PHP_
safe_mode_protected_env_vars = LD_LIBRARY_PATH
auto_append_file =
disable_classes =
display_startup_errors = Off
user_dir =
enable_dl = Off
register_argc_argv = Off
display_errors = Off
open_basedir = "/var/www/hosts/sito/:/tmp/"
allow_call_time_pass_reference = Off
safe_mode_exec_dir =
default_socket_timeout = 60
html_errors = Off
register_globals = Off
unserialize_callback_func =
y2k_compliance = On
magic_quotes_runtime = Off
expose_php = Off
log_errors_max_len = 1024
post_max_size = 8M
report_memleaks = On
engine = On
memory_limit = 128M
short_open_tag = On
max_execution_time = 60
safe_mode_include_dir =
serialize_precision = 100
precision = 14
upload_max_filesize = 128M
register_long_arrays = Off
safe_mode = off
zlib.output_compression = Off
ignore_repeated_errors = Off
request_order = "GP"
default_mimetype = "text/html"
allow_url_include = Off
disable_functions =
file_uploads = On
magic_quotes_sybase = Off
max_input_time = 60
magic_quotes_gpc = Off
error_reporting = E_ALL & ~E_DEPRECATED
safe_mode_gid = Off
auto_prepend_file =
implicit_flush = Off
allow_url_fopen = On

come vedi ho evidenziato in rosso quella che secondo me potrebbe essere la cartella base del server, ma anche cambiando i paramentri nel file di configurazione, non mi da nulla :-(