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# PHP requirements
You will need PHP 5.4 (or newer, PHP 7 is fine) compiled with the following modules (those
are actually very common and should be available in any reasonable Linux distro):
- 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-pgsql
- JSON
- XML (DOMDocument, DOMXpath)
- mbstring
- fileinfo
- PHP CLI binary (needed to run update daemon and other command line tools)
### Not required, but recommended
- CURL (highly recommended, just install it) **OR** support for remote fopen()
- POSIX functions (for the multiprocess update daemon, otherwise not needed)
- GD (needed for OTP and 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.
* **PHP safe mode is not supported.**
### Debian 9 example
<code>
$ sudo apt install php7.0-cli php7.0-curl php7.0-mbstring php7.0-json php7.0-gd php7.0-pgsql php7.0-xml php7.0-opcache
</code>
If you're starting from scratch you will also likely need several other packages, including httpd (e.g. nginx) and FPM.
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