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3f187395ea
It is too late to check for minimum version check in `lib_rss.php` because that file already contains some relatively new PHP language constructs, which will lead to a syntax error - when running with an old PHP version - instead of the expected error message.
Moved to `constants.php` for now.
Example of syntax error with PHP 7.4:
```
PHP Parse error: syntax error, unexpected '|', expecting '{' in /var/www/FreshRSS/lib/lib_rss.php on line 166
```
Should help users like in:
* https://github.com/FreshRSS/FreshRSS/discussions/7539
* https://github.com/FreshRSS/FreshRSS/issues/7557
Libraries
SimplePie
FreshRSS uses a forked version of SimplePie, with a number of patches.
See the read-me of our fork.
Updating libraries
Some of the libraries in this folder can be updated semi-automatically by invoking:
cd ./FreshRSS/lib/
composer update --no-autoloader
Remember to read the change-logs, proof-read the changes, preserve possible local patches, add irrelevant files to .gitignore (minimal installation), and test before committing.