PHP Tutorial - PHP xml_set_element_handler() Function

The xml_set_element_handler() function specifies functions to be called at the start and end of an element in the XML document.

Syntax

PHP xml_set_element_handler() Function has the following syntax.

xml_set_element_handler(parser,start,end)

Parameter

Parameter	Is Required	Description
parser	Required.	XML parser to use
start	Required.	A function to be called at the start of an element
end	Required.	A function to be called at the end of an element

The Function specified by the "start" parameter must have three parameters:

Parameter	Is Required	Description
parser	Required.	A variable containing the XML parser calling the handler
name	Required.	A variable containing the name of the elements, that triggers this function, from the XML file as a string
data	Required.	An array containing the elements attributes from the XML file as a string

The Function specified by the "end" parameter must have two parameters:

Parameter	Is Required	Description
parser	Required.	A variable containing the XML parser calling the handler
name	Required.	A variable containing the name of the elements, that triggers this function, from the XML file as a string

Return

This function returns TRUE on success, or FALSE on failure.

Example

XML File

<?xml version="1.0" encoding="ISO-8859-1"?>
<Book>
    <name>PHP</name>
    <name>Java</name>
</Book>

Set functions to be called at the start and end of an element in the XML document


<?php//  w ww  .ja va2 s .c o m
$parser=xml_parser_create();

function start($parser,$element_name,$element_attrs){
  switch($element_name){
    case "name":
       echo "name";
    }
  }

function stop($parser,$element_name){
  echo "\n";
}
function char($parser,$data){
  echo $data;
}

xml_set_element_handler($parser,"start","stop");
xml_set_character_data_handler($parser,"char");
$fp=fopen("test.xml","r");

while ($data=fread($fp,1024)){
  xml_parse($parser,$data,feof($fp)) or 
  die (sprintf("XML Error: %s at line %d", 
  xml_error_string(xml_get_error_code($parser)),
  xml_get_current_line_number($parser)));
}

xml_parser_free($parser);
?>