Three methods for php to read xml files

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<? Php $ Doc = new DOMDocument (); $ Doc-> load ('books. XML ');   $ Books = $ doc-> getElementsByTagName ("book "); Foreach ($ books as $ book)   { $ Authors = $ book-> getElementsByTagName ("author "); $ Author = $ authors-> item (0)-> nodeValue;   $ Publishers = $ book-> getElementsByTagName ("publisher "); $ Publisher = $ publishers-> item (0)-> nodeValue;   $ Titles = $ book-> getElementsByTagName ("title "); $ Title = $ titles-> item (0)-> nodeValue;   Echo "$ title-$ author-$ publisher/n ";   } ?>

Regular expression parsing

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<? Php $ Xml = ""; $ F = fopen ('books. XML', 'r '); While ($ data = fread ($ f, 4096) {$ xml. = $ data ;} Fclose ($ f );   Preg_match_all ("// <book/> (.*?) /<// Book/>/s ", $ Xml, $ bookblocks );   Foreach ($ bookblocks [1] as $ block)   { Preg_match_all ("// <author/> (.*?) /<// Author/> /", $ Block, $ author ); Preg_match_all ("// <title/> (.*?) /<// Title/> /", $ Block, $ title ); Preg_match_all ("// <publisher/> (.*?) /<// Publisher/> /", $ Block, $ publisher ); Echo ($ title [1] [0]. "-". $ author [1] [0]. "-". $ Publisher [1] [0]. "/n ");   } ?>

The books. xml file is as follows:

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<Books> <Book> <Author> Jack Herrington </author> <Title> PHP Hacks </title> <Publisher> O 'Reilly </publisher> </Book> <Book> <Author> Jack Herrington </author> <Title> Podcasting Hacks </title> <Publisher> O 'Reilly </publisher> </Book> </Books>

Here is a small example to use the parser function to read xml data:

 

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<? Php $ Parser = xml_parser_create (); // Create a parser editor Xml_set_element_handler ($ parser, "startElement", "endElement"); // corresponding functions for tag setting triggering are startElement and endElenment respectively. Xml_set_character_data_handler ($ parser, "characterData"); // you can specify a function for reading data. $ Xml_file = "1.xml"; // specify the xml file to be read, which can be a url $ Filehandler = fopen ($ xml_file, "r"); // open the file   While ($ data = fread ($ filehandler, 4096 )) { Xml_parse ($ parser, $ data, feof ($ filehandler )); } // Extract 4096 bytes each time for processing Fclose ($ filehandler ); Xml_parser_free ($ parser); // Close and release the parser $ Name = false; $ Position = false; Function startElement ($ parser_instance, $ element_name, $ attrs) // function of the start tag event  { Global $ name, $ position; If ($ element_name = "NAME ")    { $ Name = true; $ Position = false; Echo "name :";   } If ($ element_name = "POSITION ") {$ Name = false; $ Position = true; Echo "position :";   } } Function characterData ($ parser_instance, $ xml_data) // function used to read data { Global $ name, $ position; If ($ position) Echo $ xml_data. "<br> "; If ($ name) Echo $ xml_data. "<br> "; } Function endElement ($ parser_instance, $ element_name) // function for ending a tag event { Global $ name, $ position; $ Name = false; $ Position = false; } ?>

The xml file code is as follows:

 

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<? Xml version = "1.0"?> <Employees> <Employee> <Name> Zhang San </name> <Position age = "45"> manager </position> </Employee> <Employees> <Employee> <Name> Li Si </name> <Position age = "45"> assistant </position> </Employee> </Employees>

Parser is a php built-in parser used to process xml. Its work consists of three events: start tag, read data, and end tag.

That is to say, when processing xml, the function performs the corresponding action to complete the conversion of xml data whenever the start tag, data, and end tag are encountered.