OPML export/import of some proprietary FreshRSS attributes (#4342)

* OPML export/import of some proprietary FreshRSS attributes
#fix https://github.com/FreshRSS/FreshRSS/issues/4077
And one of the TODOs of https://github.com/FreshRSS/FreshRSS/pull/4220
XPath options, CSS Selector, and action filters

* Bump library patch version

* OPML namespace + documentation

* Add example

1 files changed, 3 insertions, 2 deletions

diff --git a/app/Models/BooleanSearch.php b/app/Models/BooleanSearch.php
index e2f99d524..774e42073 100644
--- a/app/Models/BooleanSearch.php
+++ b/app/Models/BooleanSearch.php
@@ -5,6 +5,7 @@
  */
 class FreshRSS_BooleanSearch {
 
+	/** @var string */
 	private $raw_input = '';
 	private $searches = array();
 
@@ -54,11 +55,11 @@ class FreshRSS_BooleanSearch {
 		return null;
 	}
 
-	public function __toString() {
+	public function __toString(): string {
 		return $this->getRawInput();
 	}
 
-	public function getRawInput() {
+	public function getRawInput(): string {
 		return $this->raw_input;
 	}
 }