XML operations for PHP extension (3) -- use of XML parser and related functions

Source: Internet
Author: User
Tags processing instruction
I. XML element structure routine the first routine indent displays the starting element structure in the document. Example #1 show the XML element structure & lt ;? Php $ file

I. XML element structure routine

The first routine indent shows the start element structure in the document.

Example #1 display the XML element structure


II. XML tag ing routine

Example #1 map XML to HTML

This routine maps XML tags directly to HTML tags. Elements not found in map_array are ignored. Of course, this routine only applies to specific XML document types.

  "B","EMPHASIS" => "I","LITERAL"  => "TT");function startElement($parser, $name, $attrs){global $map_array;if (isset($map_array[$name])) {echo "<$map_array[$name]>";}}function endElement($parser, $name){global $map_array;if (isset($map_array[$name])) {echo "
 ";}}function characterData($parser, $data){echo $data;}$xml_parser = xml_parser_create();// use case-folding so we are sure to find the tag in $map_arrayxml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, true);xml_set_element_handler($xml_parser, "startElement", "endElement");xml_set_character_data_handler($xml_parser, "characterData");if (!($fp = fopen($file, "r"))) {die("could not open XML input");}while ($data = fread($fp, 4096)) {if (!xml_parse($xml_parser, $data, feof($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)));}}xml_parser_free($xml_parser);?>

III. XML external entity routine

This routine is used to highlight the XML code. An example shows how to use external entity references to include and parse other documents, how the processing commands are processed, and how to determine whether the code contained in the processing commands is "trustable ".

The XML document used for this routine is located at the bottom (and) of this routine ).

Example #1 external entity routine

 $ V) {echo "$ k = \" $ v \ "" ;}} echo ">" ;}function endElement ($ parser, $ name) {echo "</$ name>";} function characterData ($ parser, $ data) {echo"$ Data";} Function PIHandler ($ parser, $ target, $ data) {switch (strtolower ($ target) {case" php ": global $ parser_file; // if the document to be parsed is "trustable", it indicates that the internal PHP code can be safely executed. Otherwise, the code content is displayed. 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 ("cocould 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), evaluate ($ 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, parser, 1); xml_set_element_handler ($ xml_parser, "startElement", "endElement"); aggregate ($ xml_parser, "characterData"); aggregate ($ 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 ("cocould not open XML input");} echo"
";while ($data = fread($fp, 4096)) {if (!xml_parse($xml_parser, $data, feof($fp))) {die(sprintf("XML error: %s at line %d\n",xml_error_string(xml_get_error_code($xml_parser)),xml_get_current_line_number($xml_parser)));}}echo "
"; Echo" parse complete \ n "; xml_parser_free ($ xml_parser);?>

Example #2 xmltest. xml

  Title &plainEntity; 
   About this Document  

This file is contained in:

Example #3 xmltest2.xml


IV. XML parser functions
  • Utf8_decode-converts a UTF-8 string encoded in ISO-8859-1 to a single-byte ISO-8859-1 string.

  • Utf8_encode-convert a ISO-8859-1-encoded string to a UTF-8-encoded string

  • Xml_error_string-get the error string of the XML parser

  • Xml_get_current_byte_index-get the current byte index of the XML parser

  • Xml_get_current_column_number-get the current column number of the XML parser

  • Xml_get_current_line_number-get the current row number of the XML parser

  • Xml_get_error_code-get XML parser error code

  • Xml_parse_pai_struct-parse XML data into an array

  • Xml_parse-start parsing an XML document

  • Xml_parser_create_ns-generate an XML parser that supports namespaces

  • Xml_parser_create-create an XML parser

  • Xml_parser_free-release the specified XML parser

  • Xml_parser_get_option-get the option setting information from the XML parser

  • Xml_parser_set_option-set options for specified XML parsing

  • Xml_set_character_data_handler-create a character data processor

  • Xml_set_default_handler-create a default processor

  • Xml_set_element_handler-creates the start and end element processor

  • Xml_set_end_namespace_decl_handler-create an end namespace claim processor

  • Xml_set_external_entity_ref_handler-create external entity pointing to processor

  • Xml_set_notation_decl_handler-creates a Annotation declaration processor

  • Xml_set_object-use the XML parser in the object

  • Xml_set_processing_instruction_handler-create a processing instruction (PI) processor

  • Xml_set_start_namespace_decl_handler-create the starting namespace declaration processor

  • Xml_set_unparsed_entity_decl_handler-creates an unresolved Entity Definition claim processor

The above is the content above. For more information, see The PHP Chinese website (www.php1.cn )! For more information, see The PHP Chinese website (www.php1.cn )!

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.