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% PHP requirements
- ***Host installations are not supported starting 2021. Consider using [Docker](InstallationNotes) when planning new tt-rss installations.***
- *The following applies to host installations only, updates are handled out of the box if using recommended [dockerized setup](https://git.tt-rss.org/fox/ttrss-docker-compose). The following list may be outdated.*
- *This document is considered deprecated.*
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You will need PHP 7.1 (or newer) with the following modules enabled:
- PDO, with support for PostgreSQL or MySQL depending on the database server used (some distributions need both PDO and database-specific packages, i.e. ```php-pdo``` and ```php-pgsql```)
- JSON
- XML (DOMDocument, DOMXpath)
- Internationalization (intl)
- mbstring
- fileinfo
You will also need a PHP command line interpreter (to run update daemon and other CLI tools).
### Also recommended
- CURL (highly recommended, just install it) **OR** support for remote fopen()
- POSIX functions (for the multiprocess update daemon, otherwise not needed)
- GD (needed by some plugins)
- Some kind of opcode cache/accelerator (depends on PHP version: php5-apc, php7-opcache, etc)
### Notes
* If your PHP install is missing any of the required modules tt-rss should notify you on startup.
* Plugins may have additional dependencies i.e. several bundled plugins require CURL.
### Debian 9 example
```
$ sudo apt install php7.0-cli php7.0-curl php7.0-mbstring \
php7.0-json php7.0-intl php7.0-gd php7.0-pgsql php7.0-xml php7.0-opcache
```
If you're starting from scratch you will also likely need several other packages, including httpd (e.g. nginx) and FPM.
Note: Don't forget to enable opcache in php.ini if it's not enabled by default.
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