Possible values for ext-name:
bcmath
bz2
calendar
ctype
curl
dba
dom
enchant
exif
fileinfo
filter
ftp
gd
gettext
gmp
hash
iconv
imap
interbase
intl
json
ldap
mbstring
mcrypt
mssql
mysql
mysqli
oci8
odbc
opcache
pcntl
pdo
pdo_dblib
pdo_firebird
pdo_mysql
pdo_oci
pdo_odbc
pdo_pgsql
pdo_sqlite
pgsql
phar
posix
pspell
readline
recode
reflection
session
shmop
simplexml
snmp
soap
sockets
spl
standard
sybase_ct
sysvmsg
sysvsem
sysvshm
tidy
tokenizer
wddx
xml
xmlreader
xmlrpc
xmlwriter
xsl
zip