PHP高亮显示 XML 源代码

　　它将说明如何外部实体指向处理器来包含和解析其它文档，如何处理 PIs，以及一种确定包含有 PIs 的代码的可信度。

　　能被该范例使用的的 XML 文档（xmltest.xml 和 xmltest2.xml）被列在该范例之后。

　　外部实体范例

$file = "xmltest.xml";

function trustedFile($file) {
   // only trust local files owned by ourselves
   if (!eregi("^([a-z]+)://", $file)
       && fileowner($file) == getmyuid()) {
           return true;
   }
   return false;
}

function startElement($parser, $name, $attribs) {
   print "$name";
   if (sizeof($attribs)) {
       while (list($k, $v) = each($attribs)) {
           print " $k=\"                   color=\"#990000\">$v\"";
       }
   }
   print ">";
}

function endElement($parser, $name) {
   print "$name>";
}

function characterData($parser, $data) {
   print "$data";
}

function PIHandler($parser, $target, $data) {
   switch (strtolower($target)) {
       case "php":
           global $parser_file;
           // If the parsed document is "trusted", we say it is safe
           // to execute PHP code inside it.  If not, display the code
           // instead.
           if (trustedFile($parser_file[$parser])) {
               eval($data);
           } else {
               printf("Untrusted PHP code: %s",
                       htmlspecialchars($data));
           }
           break;
   }
}

function defaultHandler($parser, $data) {
   if (substr($data, 0, 1) == "&" && substr($data, -1, 1) == ";") {
       printf('%s',
               htmlspecialchars($data));
   } else {
       printf('%s',
               htmlspecialchars($data));
   }
}

function externalEntityRefHandler($parser, $openEntityNames, $base, $systemId,
                                 $publicId) {
   if ($systemId) {
       if (!list($parser, $fp) = new_xml_parser($systemId)) {
           printf("Could not open entity %s at %s\n", $openEntityNames,
                   $systemId);
           return false;
       }
       while ($data = fread($fp, 4096)) {
           if (!xml_parse($parser, $data, feof($fp))) {
               printf("XML error: %s at line %d while parsing entity %s\n",
                       xml_error_string(xml_get_error_code($parser)),
                       xml_get_current_line_number($parser), $openEntityNames);
               xml_parser_free($parser);
               return false;
           }
       }
       xml_parser_free($parser);
       return true;
   }
   return false;
}

function new_xml_parser($file) {
   global $parser_file;

   $xml_parser = xml_parser_create();
   xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, 1);
   xml_set_element_handler($xml_parser, "startElement", "endElement");
   xml_set_character_data_handler($xml_parser, "characterData");
   xml_set_processing_instruction_handler($xml_parser, "PIHandler");
   xml_set_default_handler($xml_parser, "defaultHandler");
   xml_set_external_entity_ref_handler($xml_parser, "externalEntityRefHandler");
  
   if (!($fp = @fopen($file, "r"))) {
       return false;
   }
   if (!is_array($parser_file)) {
       settype($parser_file, "array");
   }
   $parser_file[$xml_parser] = $file;
   return array($xml_parser, $fp);
}

if (!(list($xml_parser, $fp) = new_xml_parser($file))) {
   die("could not open XML input");
}

print "

";<br>while ($data = fread($fp, 4096)) {<br>   if (!xml_parse($xml_parser, $data, feof($fp))) {<br>       die(sprintf("XML error: %s at line %d\n",<br>                   xml_error_string(xml_get_error_code($xml_parser)),<br>                   xml_get_current_line_number($xml_parser)));<br>   }<br>}<br>print "

";
print "parse complete\n";
xml_parser_free($xml_parser);
?> 
 

　　xmltest.xml

]>

 
 
 
  
   
     a1b1c1
     a2c2
     a3b3c3
   
  
 
 
 &systemEntity;
 

 
 
  
  
 
 

以下文档将被 xmltest.xml 文件调用： xmltest2.xml

]>

  
   &testEnt;