php XML 读写创建

一、XML 读

1.1、首先同目录定义好一个XML文件：

book.xml

<?xml version="1.0" encoding="utf-8"?>
<books>
  <book>
    <id>1</id>
    <name>书本001</name>
  </book>
    <book>
    <id>2</id>
    <name>书本002</name>
  </book>
    <book>
    <id>3</id>
        <name>书本003</name>
  </book>
    <title>这是标题</title>
</books>

1.2 通过 getElementsByTagName 读取XML

$xml=new DOMDocument();
$xml->load("book.xml");
// 通过 getElementsByTagName 读取
foreach($xml->getElementsByTagName('book') as $book)
{
    $id=$book->getElementsByTagName("id");
    $name=$book->getElementsByTagName("name");
    echo "id:".$id->item(0)->nodeValue.",name:".$name->item(0)->nodeValue."<br/>";
}

1.3 通过 simplexml_import_dom 直接读取属性

// 通过simplexml_import_dom  直接读取属性
$simplexml = simplexml_import_dom($xml);
echo "sid->title:".$simplexml->title;

echo  "the id is :".$simplexml->book[0]->id;
echo  "the id is :".$simplexml->title;

二、XML 创建

2.1、通过字符串创建XML document 元素

$xmlString=<<<XML
<?xml version="1.0" encoding="utf-8"?>
<books>
  <book>
    <id>1</id>
    <name>书本001</name>
  </book>
    <book>
    <id>2</id>
    <name>书本002</name>
  </book>
    <book>
    <id>3</id>
        <name>书本003</name>
  </book>
    <title>这是标题</title>
</books>
XML;


$dom=new DomDocument;
$dom->loadXML($xmlString);

2.2 通过 DOMDocument api 创建XML 对象（子节点，节点属性，CDATA属性值标记）

class buildXml
{

    /*
     *  创建一个XML元素
     * */
    private function  createXml()
    {
        $dom = new DOMDocument("1.0");
        $books = $dom->createElement("books");

        for ($i = 0; $i < 4; $i++) {
            $book = $dom->createElement("book");

// 为book 节点添加一个属性
            $price = $dom->createAttribute("price");
            $priceValue = $dom->createTextNode($i * 10);
            $price->appendChild($priceValue);
            $book->appendChild($price);


// 添加一个id 接点元素 并赋值
            $id = $dom->createElement("id");
            $idValue = $dom->createTextNode($i);
            $id->appendChild($idValue);
            $book->appendChild($id);

//  添加一个待 CDATA标识的内容
            $title = $dom->createElement("title");
            $titleValue = $dom->createCDATASection("这是一个带CDATA标签的内容");
            $title->appendChild($titleValue);
            $book->appendChild($title);
            $books->appendChild($book);
        }

        $dom->appendChild($books);
        return $dom->saveXML();
    }


    // 输出XML
    public function  printXML()
    {
        header("Content-Type: text/xml");
        echo $this->createXml();
    }

    // 保存XML
    public function  saveXML()
    {
        $result = false;
        try {
            //打开要写入 XML数据的文件
            $fp = fopen("newxml.xml", "w");
            //写入 XML数据
            fwrite($fp, $this->createXml());
            //关闭文件
            fclose($fp);
            $result = true;
        } catch (Exception $e) {
            print $e->getMessage();
            exit();
        }
        return $result;
    }
}

2.3 http 输出 XML

require_once "buildXml.php";

$xml = new buildXml;
 echo $xml->printXML();

2.4 已文件形式保存 XML

require_once "buildXml.php";

$xml = new buildXml;
$xml->saveXML();

php XML 读写 创建

php XML 读写创建