/usr/share/php/arc/parsers/ is in libarc-php 2.2.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/arc/parsers/ARC2_AtomParser.php
/usr/share/php/arc/parsers/ARC2_CBJSONParser.php
/usr/share/php/arc/parsers/ARC2_JSONParser.php
/usr/share/php/arc/parsers/ARC2_LegacyXMLParser.php
/usr/share/php/arc/parsers/ARC2_RDFParser.php
/usr/share/php/arc/parsers/ARC2_RDFXMLParser.php
/usr/share/php/arc/parsers/ARC2_RSSParser.php
/usr/share/php/arc/parsers/ARC2_SGAJSONParser.php
/usr/share/php/arc/parsers/ARC2_SPARQLParser.php
/usr/share/php/arc/parsers/ARC2_SPARQLPlusParser.php
/usr/share/php/arc/parsers/ARC2_SPARQLXMLResultParser.php
/usr/share/php/arc/parsers/ARC2_SPOGParser.php
/usr/share/php/arc/parsers/ARC2_SemHTMLParser.php
/usr/share/php/arc/parsers/ARC2_TurtleParser.php