Home Backend Development PHP Tutorial Example code for reading and writing XML DOM with PHP_PHP tutorial

Example code for reading and writing XML DOM with PHP_PHP tutorial

Jul 21, 2016 pm 02:54 PM
doc dom domdocument new php xml code and Example use of write read

// Read XML using DOM
$doc = new DOMDocument();
$doc->load(‘test.xml’);

$books = $doc->getElementsByTagName(“book”);

foreach( $books as $book ){
$authors = $book->getElementsByTagName(“author”);
$author = $authors->item(0)->nodeValue; // The nodeValue attribute can set or return the value of a node according to the node type.

$publishers = $book->getElementsByTagName(“publisher”);
$publisher = $publishers->item(0)->nodeValue;

$titles = $book->getElementsByTagName( ”title” );
$title = $titles->item(0)->nodeValue;

echo ”Title: $title
Author: $author
Publisher: $publisher



”;
}

/*
The script first creates a new DOMdocument object, and uses the load method to load the book XML into this object. Afterwards, the script uses the getElementsByName method to get a list of all elements under the specified name.
In the loop of the book node, the script uses the getElementsByName method to obtain the nodeValue of the author, publisher and title tags. nodeValue is the text in the node. The script then displays these values.
*/

// Read XML with SAX parser

$g_books = array();
$g_elem = null;

function startElement( $parser, $name, $attrs ){
global $g_books, $g_elem;
if ( $name == 'BOOK' ) $g_books []= array();
$g_elem = $name;
}

function endElement( $parser, $name ){
global $g_elem;
$g_elem = null;
}

function textData( $parser, $text ){
global $g_books, $g_elem;
if ( $g_elem == 'AUTHOR' || $g_elem == 'PUBLISHER' || $g_elem == 'TITLE' ){
$g_books[ count( $g_books ) - 1 ][ $g_elem ] = $text;
}
}

$parser = xml_parser_create();

xml_set_element_handler( $parser, ”startElement”, ”endElement” );
xml_set_character_data_handler( $parser, ”textData” );

$f = fopen( ’test.xml’, ’r’ );

while( $data = fread( $f, 4096 ) ){
xml_parse( $parser, $data );
}

xml_parser_free( $parser );

foreach( $g_books as $book ){
echo $book['TITLE']." - ".$book['AUTHOR']." - ";
echo $book['PUBLISHER' ].”n”;
}

/*

The script first sets up the g_books array, which holds all the books and book information in memory, and the g_elem variable holds the name of the tag the script is currently processing. The script then defines the callback function. In this example, the callback functions are startElement, endElement, and textData. When opening and closing the mark, call the startElement and endElement functions respectively. Call textData on the text between the opening and closing tags.

In this example, the startElement tag looks for the book tag to start a new element in the book array. The textData function then looks at the current element to see if it is a publisher, title, or author tag. If so, the function puts the current text into the current book.

To allow parsing to continue, the script creates a parser using the xml_parser_create function. Then, set the callback handle. Afterwards, the script reads the file and sends chunks of the file to the parser. After the file is read, the xml_parser_free function removes the parser. The end of the script prints the contents of the g_books array.

*/

// Parse XML with regular expressions

$xml = ”";
$f = fopen( 'test.xml', 'r' );
while( $data = fread( $f, 4096 ) ) { $xml .= $ data; }
fclose( $f );

preg_match_all( ”/(.*?)/s”, $xml, $bookblocks );

foreach( $bookblocks[1] as $block ){
preg_match_all( ”/(.*?)/”, $block, $author );
preg_match_all ( ”/(.*?)/”, $block, $title );
preg_match_all( ”/(.*?)/” , $block, $publisher );
echo( $title[1][0].” - ”.$author[1][0].” - ”. $publisher[1][0].”n ” );
}

/*
I never recommend using regular expressions to read XML, but sometimes it is the most compatible way because the regular expression functions are always available. Do not use regular expressions to read XML directly from the user because you have no control over the format or structure of such XML. You should always use a DOM library or a SAX parser to read XML from the user.
*/

//Write XML using DOM

$books = array();
$books [] = array(
’title’ => ’PHP Hacks’,
’author’ => ’Jack Herrington’,
’publisher’ => ”O’Reilly”
);
$books [] = array(
’title’ => ’Podcasting Hacks’,
’author’ => ’Jack Herrington’,
’publisher’ => ”O’Reilly”
);

$doc = new DOMDocument();
$doc->formatOutput = true;

$r = $doc->createElement( ”books” );
$doc->appendChild( $r );

foreach( $books as $book ){
$b = $doc->createElement( ”book” );

$author = $doc->createElement( ”author” );
$author->appendChild( $doc->createTextNode( $book['author'] ) );

$b->appendChild( $author );

$title = $doc->createElement( ”title” );
$title->appendChild( $doc->createTextNode( $book['title'] ) );

$b->appendChild( $title );

$publisher = $doc->createElement( ”publisher” );
$publisher->appendChild( $doc->createTextNode( $book['publisher'] ) );

$b->appendChild( $publisher );
$r->appendChild( $b );
}

//echo $doc->saveXML();

/*
在脚本的顶部,用一些示例图书装入了 books 数组。这个数据可以来自用户也可以来自数据库。
示例图书装入之后,脚本创建一个 new DOMDocument,并把根节点 books 添加到它。然后脚本为每本书 的 author、title 和 publisher 创建节点,并为每个节点添加文本节点。每个 book 节点的最后一步是重新把它添加到根节 点 books。
使用 DOM 的真正价值在于它创建的 XML 总是格式正确的。但是如果不能用 DOM 创建 XML 时该怎么办?

Xml代码

PHP 编写xml

$books = array();
$books [] = array(
’title’ => ’PHP Hacks’,
’author’ => ’Jack Herrington’,
’publisher’ => ”O’Reilly”
);
$books [] = array(
’title’ => ’Podcasting Hacks’,
’author’ => ’Jack Herrington’,
’publisher’ => ”O’Reilly”
);
?>


foreach( $books as $book )
{
?>

<?php echo( $book['title'] ); ?>





}
?>

实例中用到的 test.xml 如下:




Jack Herrington
PHP Hacks - bkjia.com
O’Reilly


Jack Herrington
Podcasting Hacks
O’Reilly

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/364615.htmlTechArticle// 用 DOM 读取 XML $doc = new DOMDocument(); $doc-load(test.xml); $books = $doc-getElementsByTagName(book); foreach( $books as $book ){ $authors = $book-getElementsByTagName(auth...
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
1 months ago By 尊渡假赌尊渡假赌尊渡假赌
Two Point Museum: All Exhibits And Where To Find Them
1 months ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

CakePHP Project Configuration CakePHP Project Configuration Sep 10, 2024 pm 05:25 PM

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

CakePHP Date and Time CakePHP Date and Time Sep 10, 2024 pm 05:27 PM

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

To work on file upload we are going to use the form helper. Here, is an example for file upload.

CakePHP Routing CakePHP Routing Sep 10, 2024 pm 05:25 PM

In this chapter, we are going to learn the following topics related to routing ?

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

CakePHP Creating Validators CakePHP Creating Validators Sep 10, 2024 pm 05:26 PM

Validator can be created by adding the following two lines in the controller.

CakePHP Working with Database CakePHP Working with Database Sep 10, 2024 pm 05:25 PM

Working with database in CakePHP is very easy. We will understand the CRUD (Create, Read, Update, Delete) operations in this chapter.

See all articles