Php xml Expat parser

There are two basic types of XML Parser:

Tree-based Parser: This parser converts an XML document into a tree structure. It analyzes the entire document and provides APIs to access tree elements, such as the Document Object Model (DOM ).

Event-based Parser: treats XML documents as a series of events. When a specific event occurs, the parser calls a function to process it.

The Expat parser is an event-based parser.

The XML Expat parser is a core component of PHP. You can use these functions without installation.

XML file:

 
 
  
   George
  
  
   John
  
  
   Reminder
  Don't forget the meeting!
 

Initialize the XML Parser:

 ";    break;     case "TO":    echo "To: ";    break;     case "FROM":    echo "From: ";    break;     case "HEADING":    echo "Heading: ";    break;     case "BODY":    echo "Message: ";    }  }//Function to use at the end of an elementfunction stop($parser,$element_name)  {  echo "
";  }//Function to use when finding character datafunction char($parser,$data)  {  echo $data;  }//Specify element handlerxml_set_element_handler($parser,"start","stop");//Specify data handlerxml_set_character_data_handler($parser,"char");//Open XML file$fp=fopen("test.xml","r");//Read datawhile ($data=fread($fp,4096))  {  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($parser)));  }//Free the XML parserxml_parser_free($parser);?>