PHP/XML/XML Handler

Parsing a Processing Instruction

   <source lang="html4strict">

<?php

    function pi_handler ($p, $target, $data) {
       print ($target);
       print ($data);
    }
    $xml = "<?exec ls -l /var?><rootElement/>";
    $p = xml_parser_create ();
    xml_set_processing_instruction_handler ($p, "pi_handler");
    if (!xml_parse ($p, $xml, true))
         die (sprintf ("Parse error in %s (%s)",
                       htmlspecialchars ($xml),
                       xml_error_string (xml_get_error_code ($p))));
    else
         print ("XML processing complete.\n");
    xml_parser_free ($p);

?>

      </source>
   
  

Using a Default Handler

   <source lang="html4strict">

<?php

    $i = 1;
    function default_handler ($p, $data)
    {
         global $i;
         print ("$i: default: $data\n");
         $i++;
    }
    
    function cdata_handler ($p, $data)
    {
         global $i;
         print ("$i: cdata: $data\n");
         $i++;
    }
    $xml = "<foo>bar</foo><?exec command ?>";
    
    $p = xml_parser_create ();
    xml_set_default_handler ($p, "default_handler");
    xml_set_character_data_handler ($p, "cdata_handler");
    
    if (!xml_parse ($p, $xml, true)){
         die (sprintf ("
Parse error in %s (%s)",
                       htmlspecialchars ($xml),
                       xml_error_string (xml_get_error_code ($p))));
    }
    xml_parser_free ($p);

?>

      </source>
   
  

XML Cdata handler

   <source lang="html4strict">

<?php

    function cdata_handler ($parser, $data) { 
       print ($data); 
    }
    
    $xml = "<para>some character data</para>";
    $parser = xml_parser_create ();
    xml_set_character_data_handler ($parser, "cdata_handler");
    
    if (xml_parse ($parser, $xml, true))
         print ("Your XML document is well-formed.");
    else
         print ("Your XML document is not well-formed.");
    
    xml_parser_free ($parser);

?>

      </source>