Some of the modules differ between PHP version, but here’s a list of PHP 7.3 for you:
[PHP Modules]
- bcmath
- bz2
- calendar
- Core
- ctype
- curl
- date
- dba
- dom
- enchant
- exif
- fileinfo
- filter
- ftp
- gd
- gettext
- gmp
- hash
- iconv
- imap
- interbase
- intl
- ionCube Loader
- json
- ldap
- libxml
- mbstring
- mysqli
- mysqlnd
- odbc
- openssl
- pcre
- PDO
- pdo_dblib
- PDO_Firebird
- pdo_mysql
- PDO_ODBC
- pdo_pgsql
- pdo_sqlite
- pgsql
- Phar
- posix
- pspell
- readline
- Reflection
- session
- shmop
- SimpleXML
- snmp
- soap
- sockets
- sodium
- SPL
- sqlite3
- standard
- sysvmsg
- sysvsem
- sysvshm
- tidy
- tokenizer
- xml
- xmlreader
- xmlrpc
- xmlwriter
- xsl
- Zend OPcache
- zip
- zlib
[Zend Modules]
- Zend OPcache
- the ionCube PHP Loader + ionCube24
