Description:
------------
The attached short demonstration is only a tip of iceberg.
I'll submit one more bug in this area shortly.

Test script:
---------------
<?php
$indent = '';
$parser = xml_parser_create_ns('UTF-8');

xml_set_element_handler($parser, function($self, $name, $attributes){
    global $indent;
    print "{$indent}{$name} " . json_encode($attributes, 832) . "\n";
    $indent .= "\t";
  }, function($self, $name){
    global $indent;
    $indent = substr($indent, 0, -1);
    print "{$indent}/{$name}\n";
  });
xml_set_character_data_handler($parser, function($self, $data){
    global $indent;
    if($text = trim($data))
      print "{$indent}#text: {$text}\n";
  });


xml_parse($parser, '<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE x [
  <!ENTITY pic PUBLIC "image.gif" "http://example.org/image.gif">
]>
<p>&pic;</p>', true);

// Expecting at least 'Undeclared entity error' (entity was declared for a different root tag).
print xml_error_string(xml_get_error_code($parser)) . "\n";
?>

Expected result:
----------------
I would expect "Undeclared entity error" at the very least.
Optimally "Mismatched tag" (wrong root tag).

Actual result:
--------------
"No error".