PHP self-study road-----Basic introduction to XML programming (Xpath technology, simpleXml technology)

The core idea of XPath's design is that you can quickly and briefly locate the node you want to find through xpath. The main purpose is to describe the position of a node relative to other nodes. All nodes that meet the conditions can be obtained and become [position path].

Xapth is mainly used to query information in XML documents. It can parse XML files and read data in XML files by using path expressions

The following is a case introduction. The XML file is as follows (simplexml.xml):

[php]

sb001

200

xiaoming

tianlongbabu

sb002

400

daming

xiaoaojianghu

The PHP code is as follows:

[php]

//1 Create DOMDocument object

$dom = new DOMDocument("1.0", "UTF-8");

//2 Load Xml file

$dom->load("simplexml.xml");

//3 Convert to DomXPath object

$xpath = new DOMXPath($dom);

//4 Find a job

$node_list = $xpath->query("/books/book/title");

echo "There are ".$node_list->length."
";

for($i=0; $i<$node_list->length;$i++){

$node = $node_list->item($i);

// var_dump($node_list);

/*foreach ($node as $key=>$val){

echo

; } */

echo $node->nodeName.":".$node->nodeValue."
";

}

Enter the following:

There are 2 in total

title:tianlongbabu

title:xiaoaojianghu

If you want to know more about the use of XPath,

simpleXml

The core idea of simpleXMl: use an object-oriented method to operate Xml files. simpleXml is a relatively simple method, usually used in conjunction with XPath,

[php]

//Loading method 1 ‘Load an Xml file

// $lib = simplexml_load_file("simplexml.xml");

//2 DOM object loading method

//1 Create DOMDocument object

$dom = new DOMDocument("1.0", "UTF-8");

//2 Load Xml file

$dom->load("simplexml.xml");

$lib = simplexml_import_dom($dom);

echo "

"; </div>
<div> // var_dump($lib);/*1*/ </div>
<div> echo "

//Take out the book,

$books = $lib->book;

/* //Take out the first book

$book1=$books[0];

//Get the book title

echo $book1->title.":".$book1->author; */

for($i=0;$i

$book1=$books[$i];

//Get attributes

echo "Attribute:".$book1['house']."
";

echo "Title of the book ".$i."||Author
";

echo $book1->title."||".$book1->author."
";

}

echo "***simplexml and xpath combined***
";

echo "Get all book titles:
";

$titles = $lib->xpath("//title");

foreach ($titles as $key=>$val){

echo "
".$key."||".$val;

}

echo "
************************************";

The output is as follows:

[php]

Attribute: qinghuachubanshe

Title of Book 0||Author

tianlongbabu||xiaoming

Attribute: beidachubanshe

Title of Book 1||Author

xiaoaojianghu||daming

***simplexml and xpath combined***

Retrieve all book titles:

0||tianlongbabu

1||xiaoaojianghu

**********************************

The third way to reprint Xml, string mode, is as follows:

[php]

echo "
simplexml can also directly load a string (Xml specification)";

$string = <<

Forty What?

Joe

Jane

I know that's the answer -- but what's the question?

XML;

$xml = simplexml_load_string($string);

print_r($xml);

Related labels：

php simplexml xpath getting Started Base technology core of programming Self-study design

source：php.cn

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PHP self-study road-----Basic introduction to XML programming (Xpath technology, simpleXml technology)_PHP tutorial

; } */