Several ways to write and read XML in PHP

Last Update:2018-12-08 Source: Internet

Author: User

Tags addchild

Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

1. Use DOM to generate and read XML files
Instance 1: Copy codeThe Code is as follows: <? Php
// Creates XML string and XML document using the DOM
$ Dom = new DomDocument ('1. 0 ');
// Add root-<books>
$ Books = $ dom-> appendChild ($ dom-> createElement_x_x ('books '));
// Add <book> element to <books>
$ Book = $ books-> appendChild ($ dom-> createElement_x_x ('book '));
// Add <title> element to <book>
$ Title = $ book-> appendChild ($ dom-> createElement_x_x ('title '));
// Add <title> text node element to <title>
$ Title-> appendChild ($ dom-> createTextNode ('great American novel '));
// Generate xml
$ Dom-> formatOutput = true; // set the formatOutput attribute of domDocument to true
// Save XML as string or file
$ Test1 = $ dom-> saveXML (); // put string in test1
$ Dom-> save ('test1. xml'); // save as file
?>

Example 2:Copy codeThe Code is as follows: $ aa = "111 ";
$ Xmlstr = <XML
<? Xml version = '1. 0'?>
<Document>
<Title >{$ aa} </title>
<From> Joe </from>
<To> Jane </to>
<Body>
I know that's the answer -- but what's the question?
</Body>
</Document>
XML;
$ Dom = new domDocument;
$ Dom-> loadXML ($ xmlstr );
$ Test1 = $ dom-> saveXML ();
$ Dom-> save ('test1. xml ');

Example 3:
Test1.xml:Copy codeThe Code is as follows: <? Xml version = "1.0"?>
<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>

Example. php:Copy codeThe Code is as follows: $ doc = new DOMDocument ();
$ Doc-> load ('test1. 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 ";
}

Ii. Use simple to generate and read xml files
Instance 1:Copy codeThe Code is as follows: <?
$ Xmlstr = <XML
<? Xml version = '1. 0' standalone = 'Yes'?>
<Books>
<Book>
<Title> Great American Novel </title>
<Characters>
<Character>
<Name> Cliff </name>
<Desc> really great guy </desc>
</Character>
<Character>
<Name> Lovely Woman </name>
<Desc> matchless beauty </desc>
</Character>
<Character>
<Name> Loyal Dog </name>
<Desc> sleepy </desc>
</Character>
</Characters>
<Plot>
Cliff meets Lovely Woman. Loyal Dog sleeps, but wakes up to bark
At mailman.
</Plot>
<Success type = 'descrier'> 4 </success>
<Success type = 'bookclubs '> 9 </success>
</Book>
</Books>
XML;

// Extract node content
$ Xml = new SimpleXMLElement ($ xmlstr );
Foreach ($ xml-> book [0]-> success as $ success ){
Switch (string) $ success ['type']) {// Get attributes as element indices
Case 'descrier ':
Echo $ success. 'months on bestseller list <br> ';
Break;
Case 'bookclubs ':
Echo $ success. 'bookclub listings ';
Break;
}
}

// Modify the content of a text node
$ Xml = new SimpleXMLElement ($ xmlstr );
$ Xml-> book [0]-> characters-> character [0]-> name = 'Big cliff ';
Echo $ xml-> asXML ();

// Add the text node of the child element
$ Xml = new SimpleXMLElement ($ xmlstr );
$ Character = $ xml-> book [0]-> characters-> addChild ('character ');
$ Character-> addChild ('name', 'Yellow cat ');
$ Character-> addChild ('desc', 'aloof ');
$ Success = $ xml-> book [0]-> addChild ('success ', '2 ');
$ Success-> addattrits ('type', 'reprints ');
Echo $ xml-> asXML ();

Example 2:Copy codeThe Code is as follows: if (file_exists ('test1. xml') {// read the xml file
$ Xml = simplexml_load_file ('test1. xml ');
Var_dump (xml );
} Else {
Exit ('failed' to open test1.xml .');
}

Iii. DOM and simple interoperability
DOM import simpleXML:Copy codeThe Code is as follows: <? Php
$ Sxe = simplexml_load_string ('<books> <book> <title> Great American
Novel </title> </book> </books> ');
If ($ sxe ===false ){
Echo 'error while parsing the document ';
Exit;
}
$ Dom_sxe = dom_import_simplexml ($ sxe );
If (! $ Dom_sxe ){
Echo 'error while converting xml ';
Exit;
}
$ Dom = new DOMDocument ('1. 0 ');
$ Dom_sxe = $ dom-> importNode ($ dom_sxe, true );
$ Dom_sxe = $ dom-> appendChild ($ dom_sxe );
$ Test2 = $ dom-> saveXML (); // put string in test2
$ Dom-> save ('test2. xml'); // save as file
?>

SimpleXML import DOM:Copy codeThe Code is as follows: <? Php
$ Dom = new domDocument;
$ Dom-> loadXML ('<books> <book> <title> Great American
Novel </title> </book> </books> ');
If (! $ Dom ){
Echo 'error while parsing the document ';
Exit;
}
$ S = simplexml_import_dom ($ dom );
Echo $ s-> book [0]-> title; // Great American Novel
?>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

A Free Trial That Lets You Build Big!

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

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

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

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More