Description:
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Line feed characters has beed accidentally removed from a tag attributes.

Reproduce code:
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$string = "<a title=\" 123 \n 456 \r\n 789 \">link</a>";
$parser = xml_parser_create();
xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 0);
xml_parse_into_struct($parser, $string, $values, $tags);
xml_parser_free($parser);
print '<pre>';
print_r( $values );
print '</pre>';

Expected result:
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I expect to keep all line feed characters in attributes.
Better if it could be possible add a special option 
for xml_parser, like 
xml_parser_set_option($parser, XML_OPTION_KEEP_LF, 1);