用PHP编写和读取XML的几种方式
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2022-06-29 21:28:00
一.使用dom生成和读取xml文件 实例一： 复制代码 代码如下:
一.使用dom生成和读取xml文件
实例一：
<?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
?>
实例二：
$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');
实例三：
test1.xml:
<?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:
$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";
}
二.使用simple生成和读取xml文件
实例一：
<?
$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='bestseller'>4</success>
<success type='bookclubs'>9</success>
</book>
</books>
xml;
//提取节点内容
$xml = new simplexmlelement($xmlstr);
foreach ($xml->book[0]->success as $success) {
switch((string) $success['type']) { // get attributes as element indices
case 'bestseller':
echo $success. ' months on bestseller list<br>';
break;
case 'bookclubs':
echo $success. ' bookclub listings';
break;
}
}
//修改文本节点内容
$xml = new simplexmlelement($xmlstr);
$xml->book[0]->characters->character[0]->name = 'big cliff';
echo $xml->asxml();
//添加子元素的文本节点
$xml = new simplexmlelement($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->addattribute('type', 'reprints');
echo $xml->asxml();
?>
实例二：
if (file_exists('test1.xml')) { //读取xml文件
$xml = simplexml_load_file('test1.xml');
var_dump(xml);
} else {
exit('failed to open test1.xml.');
}
三.dom和simple互操作
dom导入simplexml：
<?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导入dom：
<?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
?>
实例一：
复制代码 代码如下:
<?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
?>
实例二：
复制代码 代码如下:
$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');
实例三：
test1.xml:
复制代码 代码如下:
<?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:
复制代码 代码如下:
$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";
}
二.使用simple生成和读取xml文件
实例一：
复制代码 代码如下:
<?
$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='bestseller'>4</success>
<success type='bookclubs'>9</success>
</book>
</books>
xml;
//提取节点内容
$xml = new simplexmlelement($xmlstr);
foreach ($xml->book[0]->success as $success) {
switch((string) $success['type']) { // get attributes as element indices
case 'bestseller':
echo $success. ' months on bestseller list<br>';
break;
case 'bookclubs':
echo $success. ' bookclub listings';
break;
}
}
//修改文本节点内容
$xml = new simplexmlelement($xmlstr);
$xml->book[0]->characters->character[0]->name = 'big cliff';
echo $xml->asxml();
//添加子元素的文本节点
$xml = new simplexmlelement($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->addattribute('type', 'reprints');
echo $xml->asxml();
?>
实例二：
复制代码 代码如下:
if (file_exists('test1.xml')) { //读取xml文件
$xml = simplexml_load_file('test1.xml');
var_dump(xml);
} else {
exit('failed to open test1.xml.');
}
三.dom和simple互操作
dom导入simplexml：
复制代码 代码如下:
<?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导入dom：
复制代码 代码如下:
<?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
?>