Php xml Parser function application example

Xml functions are the core component of php. These functions can be used without installation.
Php xml parser function
Php: indicates the earliest php version that supports this function.

Function description php
Utf8_decode () decodes UTF-8 strings into ISO-8859-1. 3
Utf8_encode () encodes the ISO-8859-1 string into UTF-8. 3
Xml_error_string () gets the error description of the xml parser. 3
Xml_get_current_byte_index () gets the current byte index of the xml parser. 3
Xml_get_current_column_number () gets the current column number of the xml parser. 3
Xml_get_current_line_number () gets the current row number of the xml parser. 3
Xml_get_error_code () gets the error code of the xml parser. 3
Xml_parse () parses xml documents. 3
Xml_parse_into_struct () parses xml data into an array. 3
Xml_parser_create_ns () creates an xml parser with namespace support. 4
Xml_parser_create () creates an xml parser. 3
Xml_parser_free () releases the xml parser. 3
Xml_parser_get_option () gets the option setting information from the xml parser. 3
Xml_parser_set_option () is used to set options for xml parsing. 3
Xml_set_character_data_handler () creates a character data processor. 3
Xml_set_default_handler () creates the default data processor. 3
Xml_set_element_handler () creates the start and end element processor. 3
Xml_set_end_namespace_decl_handler () is created to terminate the namespace claim processor. 4
Xml_set_external_entity_ref_handler () creates an external entity processor. 3
Xml_set_notation_decl_handler () creates a Annotation declaration processor. 3
Xml_set_object () uses the xml parser in the object. 4
Xml_set_processing_instruction_handler () creates a processing instruction (pi) processor. 3
Xml_set_start_namespace_decl_handler () creates the starting namespace declaration processor. 4
Xml_set_unparsed_entity_decl_handler () creates an unresolved entity definition declarative processor. 3

*/
$ File = "test. xml"; // defines the xml file
$ Character_data_on = false; // defines a Boolean variable.
$ Tag_complete = true; // defines a Boolean variable.
Function startelement ($ parser, $ name, $ attrs) // defines the start callback function.
{
Global $ character_data_on;
Global $ tag_complete;
Echo "& lt; <font color =" # 0000cc "> $ name </font> ";
If (sizeof ($ attrs ))
  {
While (list ($ k, $ v) = each ($ attrs ))
    {
Echo "<font color =" #009900 "> $ k </font> =" <fontcolor = "#990000"> $ v </font> "";
    }
  }
$ Tag_complete = false; // defines a Boolean variable.
$ Character_data_on = false; // defines a Boolean variable.
}
Function endelement ($ parser, $ name) // defines the termination callback function
{
Global $ fp;
Global $ character_data_on;
Global $ tag_complete;
If (! $ Character_data_on)
  {
$ Temp_fp = ftell ($ fp );
$ End_element_byte_index = xml_get_current_byte_index ($ parser );
Fseek ($ fp, $ end_element_byte_index-2 );
$ Validator = fgets ($ fp, 3 );
Fseek ($ fp, $ temp_fp );
If ($ validator = "/> ")
    {
Echo "/& gt ";
    }
Else echo "& gt & lt/<font color =" # 0000cc "> $ name </font> & gt ";
$ Tag_complete = true;
  }
Else echo "& lt/<font color =" # 0000cc "> $ name </font> & gt ";
$ Character_data_on = false;
}
Function characterdata ($ parser, $ data) // defines the callback function
{
Global $ character_data_on;
Global $ tag_complete;
If ((! $ Character_data_on )&&(! $ Tag_complete ))
  {
Echo "& gt ";
$ Tag_complete = true;
  }
Echo "<B> $ data </B> ";
$ Character_data_on = true;
}
$ Xml_parser = xml_parser_create (); // Create an xml parser
Xml_parser_set_option ($ xml_parser, xml_option_case_folding, false); // Set the parser
Xml_set_element_handler ($ xml_parser, "startelement", "endelement"); // creates an element processor.
Xml_set_character_data_handler ($ xml_parser, "characterdata"); // create a character data processor
If (! ($ Fp = fopen ($ file, "r") // if the file fails to be opened
{
Die ("cocould not open xml input"); // output error message
}
Echo "<pre> ";
While ($ file_content = fread ($ fp, 4096) // read the content cyclically
{
If (! Xml_parse ($ xml_parser, $ file_content, feof ($ fp )))
  {
Die (sprintf ("xml error: % s at line % d ",
Xml_error_string (xml_get_error_code ($ xml_parser )),
Xml_get_current_line_number ($ xml_parser )));
  }
}
Echo "</pre> ";
Xml_parser_free ($ xml_parser); // release the xml parser
?>

Instance 2

<? Php
Class xmlparser // define a class
{
Var $ xmlparser; // class attributes
Function xmlparser () // class method
  {
$ This-> xmlparser = xml_parser_create ();
Xml_set_object ($ this-> xmlparser, $ this );
Xml_set_character_data_handler ($ this-> xmlparser, "char ");
Xml_set_element_handler ($ this-> xmlparser, "start_tag", "end_tag ");
  }
Function parse ($ data) // class method
  {
Xml_parse ($ this-> xmlparser, $ data );
  }
Function parse_file ($ xmlfile) // class method
  {
$ Fp = fopen ($ xmlfile, 'r ');
While ($ xmldata = fread ($ fp, 4096 ))
    {
If (! Xml_parse ($ this-> xmlparser, $ xmldata ))
      {
Die (print "error :".
Xml_error_string (xml_get_error_code ($ this-> xmlparser). "<br/> line :".
Xml_get_current_line_number ($ this-> xmlparser). "<br/> column :".
Xml_get_current_column_number ($ this-> xmlparser). "<br/> ");
      }
    }
  }
Function start_tag ($ xmlparser, $ tag, $ attributes) // class method
  {
Print $ tag. "<br/> ";
  }
Function end_tag () // method of the class
  {
  }
Function char ($ xmlparser, $ data) // class method
  {
Echo $ data. "<br/> ";
  }
Function close_parser () // method of the class
  {
Xml_parser_free ($ this-> xmlparser );
  }
}
$ Myxmlparser = new xmlparser (); // Initialize an object for the class
$ Myxmlparser-> parse_file ("test. xml"); // call the file reading method of the class.
$ Myxmlparser-> close_parser (); // call the close method of the class
/*
Php xml parser constant
Constant
Xml_error_none (integer)
Xml_error_no_memory (integer)
Xml_error_syntax (integer)
Xml_error_no_elements (integer)
Xml_error_invalid_token (integer)
Xml_error_unclosed_token (integer)
Xml_error_partial_char (integer)
Xml_error_tag_mismatch (integer)
Xml_error_duplicate_attribute (integer)
Xml_error_junk_after_doc_element (integer)
Xml_error_param_entity_ref (integer)
Xml_error_undefined_entity (integer)
Xml_error_recursive_entity_ref (integer)
Xml_error_async_entity (integer)
Xml_error_bad_char_ref (integer)
Xml_error_binary_entity_ref (integer)
Xml_error_attribute_external_entity_ref (integer)
Xml_error_misplaced_xml_pi (integer)
Xml_error_unknown_encoding (integer)
Xml_error_incorrect_encoding (integer)
Xml_error_unclosed_cdata_section (integer)
Xml_error_external_entity_handling (integer)
Xml_option_case_folding (integer)
Xml_option_target_encoding (integer)
Xml_option_skip_tagstart (integer)
Xml_option_skip_white (integer)