#30257 [Ver->Opn]: Unexpected result of xml_get_current_byte_index and xml_get_current_column_numb

ID: 30257 Updated by: sniper@php.net Reported By: christoffer at natlikan dot se -Status: Verified +Status: Open -Bug Type: XML related +Bug Type: Documentation problem Operating System: * PHP Version: 5CVS-2005-02-02 New Comment: This difference is caused by the fact that in PHP5 we use libxml instead of expat by default. To get the expat behaviour, you can always compile PHP with --with-expat-dir=/path/to/expat This change in behaviour needs to be documented though. Previous Comments: ------------------------------------------------------------------------ [2004-09-30 01:27:16] olivier at samalyse dot com I'm experiencing similar troubles with xml_get_current_byte_index(). But I don't agree with the expected result christoffer proposes. Actually, in php4 xml_get_current_byte_index() behaves perfectly to me. Using the test code below with php version 4.3.4 produces : ElementOpen - Row: 2 Col: 0 BIndex: 44 ElementOpen - Row: 4 Col: 1 BIndex: 61 ElementOpen - Row: 5 Col: 2 BIndex: 67 ElementClose - Row: 5 Col: 8 BIndex: 73 ElementClose - Row: 6 Col: 1 BIndex: 79 ElementClose - Row: 7 Col: 0 BIndex: 84 Byte Index 44 points at the beginning of the <a> tag : <a b="x"> ^ That is fine. Now, if you omit the xml declaration '<?xml version="1.0" encoding="ISO-8859-1"?>', using php5, you will obtain : ElementOpen - Row: 1 Col: 5 BIndex: 8 ElementOpen - Row: 3 Col: 8 BIndex: 19 ElementOpen - Row: 4 Col: 11 BIndex: 25 ElementClose - Row: 4 Col: 15 BIndex: 33 ElementClose - Row: 5 Col: 18 BIndex: 39 ElementClose - Row: 6 Col: 21 BIndex: 44 Byte index 8 does not point at the beginning of the tag anymore, but at its end : <a b="x"> ^ In my particular case (XML indexing/marshalling) that's far less usable. Some may consider that's no bug, but it breaks backward compatibility with php4. Now, if you let the xml declaration in place, this function does not produce anything relevant anymore. As Christoffer reports, parsing this xml document when it includes '<?xml version="1.0" encoding="ISO-8859-1"?>' will produce : ElementOpen - Row: 2 Col: 5 BIndex: 11 ElementOpen - Row: 4 Col: 8 BIndex: 22 ElementOpen - Row: 5 Col: 11 BIndex: 28 ElementClose - Row: 5 Col: 15 BIndex: 36 ElementClose - Row: 6 Col: 18 BIndex: 42 ElementClose - Row: 7 Col: 21 BIndex: 47 In this later case, what seems to happen is that the xml declaration byte length is badly evaluated. If you add to this the fact that the returned byte index points at the end of the tag (php5) instead of the beginning of the tag (php4), it really starts to look like random output... ------------------------------------------------------------------------ [2004-09-27 20:36:13] christoffer at natlikan dot se Description: ------------ xml_get_current_byte_index and xml_get_current_column_number returns unexpected values when the XML contains a XML declaration. Using php5.0-win32-200409270830 and Apache/1.3.31. Reproduce code: --------------- <?php function elementOpen($parser, $elementName, $attributes) { echo("ElementOpen - Row: " . xml_get_current_line_number($parser) . " Col: " . xml_get_current_column_number($parser) . " BIndex: " . xml_get_current_byte_index($parser) . "<br />"); } function elementClose($parser, $elementName) { echo("ElementClose - Row: " . xml_get_current_line_number($parser) . " Col: " . xml_get_current_column_number($parser) . " BIndex: " . xml_get_current_byte_index($parser) . "<br />"); } $parser = xml_parser_create(); xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, false); xml_set_element_handler($parser, "elementOpen", "elementClose"); $xml = "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n" . "<a b=\"x\">\n" . "\ttest\n" . "\t<c>\n" . "\t\t<d>foo</d>\n" . "\t</c>\n" . "</a>"; xml_parse($parser, $xml); xml_parser_free($parser); ?> Expected result: ---------------- ElementOpen - Row: 2 Col: 10 BIndex: 52 ElementOpen - Row: 4 Col: 8 BIndex: 63 ElementOpen - Row: 5 Col: 11 BIndex: 69 ElementClose - Row: 5 Col: 9 BIndex: 73 ElementClose - Row: 6 Col: 2 BIndex: 79 ElementClose - Row: 7 Col: 1 BIndex: 85 Actual result: -------------- ElementOpen - Row: 2 Col: 5 BIndex: 11 ElementOpen - Row: 4 Col: 8 BIndex: 22 ElementOpen - Row: 5 Col: 11 BIndex: 28 ElementClose - Row: 5 Col: 15 BIndex: 36 ElementClose - Row: 6 Col: 18 BIndex: 42 ElementClose - Row: 7 Col: 21 BIndex: 47 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=30257&edit=1