php+Ajax处理xml与json格式数据的方法示例

下面是“php+Ajax处理xml与json格式数据的方法示例”的详细攻略。

一、xml数据处理

1.使用DOM进行xml数据解析

使用DOM可以很容易地解析xml数据，下面是一个简单的示例。

<?php
$xml = '<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
  <book category="WEB">
    <title>Learning XML</title>
    <author>Erik T. Ray</author>
    <year>2003</year>
    <price>39.95</price>
  </book>
  <book category="JAVA">
    <title>Thinking in Java</title>
    <author>Bruce Eckel</author>
    <year>1998</year>
    <price>49.95</price>
  </book>
</bookstore>';

$dom = new DOMDocument();
$dom->loadXML($xml);
$books = $dom->getElementsByTagName('book');

foreach ($books as $book) {
    $category = $book->getAttribute('category');
    $title = $book->getElementsByTagName('title')->item(0)->nodeValue;
    $author = $book->getElementsByTagName('author')->item(0)->nodeValue;
    $year = $book->getElementsByTagName('year')->item(0)->nodeValue;
    $price = $book->getElementsByTagName('price')->item(0)->nodeValue;
    echo "$title by $author ($category, $year) - $price\n";
}
?>

2.使用SimpleXML进行xml数据解析

使用SimpleXML可以更方便地解析xml数据，下面是一个简单的示例。

<?php
$xml = '<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
  <book category="WEB">
    <title>Learning XML</title>
    <author>Erik T. Ray</author>
    <year>2003</year>
    <price>39.95</price>
  </book>
  <book category="JAVA">
    <title>Thinking in Java</title>
    <author>Bruce Eckel</author>
    <year>1998</year>
    <price>49.95</price>
  </book>
</bookstore>';

$sxml = simplexml_load_string($xml);
foreach ($sxml->book as $book) {
    $category = (string)$book['category'];
    $title = (string)$book->title;
    $author = (string)$book->author;
    $year = (string)$book->year;
    $price = (string)$book->price;
    echo "$title by $author ($category, $year) - $price\n";
}
?>

二、json数据处理

使用json_decode可以将json数据解析为PHP对象或数组。

<?php
$json = '{ 
    "name": "Alice", 
    "age": 18, 
    "sex": "Female", 
    "hobbies": ["music", "movies", "reading"], 
    "friends": [
        {"name": "Bob", "age": 20, "sex": "Male"}, 
        {"name": "Cathy", "age": 19, "sex": "Female"}
    ] 
}';

$obj = json_decode($json); // 解析json为对象
$arr = json_decode($json, true); // 解析json为关联数组

echo $obj->name; // 输出 Alice
echo $arr['name']; // 输出 Alice
?>

三、使用Ajax进行xml和json数据的异步请求

使用Ajax可以在不刷新页面的情况下向服务器请求并接收xml或json数据，下面是一个示例。

1.发送xml数据请求，并将响应数据解析为HTML代码显示

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>XmlHttpRequest Demo</title>
    <script>
        function loadXMLDoc() {
            var xmlhttp;
            if (window.XMLHttpRequest) { // IE7+, Firefox, Chrome, Opera, Safari
                xmlhttp = new XMLHttpRequest();
            } else { // IE6, IE5
                xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            xmlhttp.onreadystatechange = function() {
                if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                    var dom = xmlhttp.responseXML;
                    var books = dom.getElementsByTagName("book");
                    var html = '';
                    for (var i = 0; i < books.length; i++) {
                        var title = books[i].getElementsByTagName("title")[0].childNodes[0].nodeValue;
                        var author = books[i].getElementsByTagName("author")[0].childNodes[0].nodeValue;
                        var category = books[i].getAttribute("category");
                        var year = books[i].getElementsByTagName("year")[0].childNodes[0].nodeValue;
                        var price = books[i].getElementsByTagName("price")[0].childNodes[0].nodeValue;
                        html += '<h3>' + title + '</h3><p>' + author + ' (' + category + ', ' + year + ') - ' + price + '</p>';
                    }
                    document.getElementById("content").innerHTML = html;
                }
            }
            xmlhttp.open("GET", "books.xml", true);
            xmlhttp.send();
        }
    </script>
</head>
<body>

<h2>Books List</h2>

<button onclick="loadXMLDoc()">Get Books</button>

<div id="content"></div>

</body>
</html>

2.发送json数据请求，并将响应数据解析为HTML代码显示

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>XmlHttpRequest Demo</title>
    <script>
        function loadJSONDoc() {
            var xmlhttp;
            if (window.XMLHttpRequest) { // IE7+, Firefox, Chrome, Opera, Safari
                xmlhttp = new XMLHttpRequest();
            } else { // IE6, IE5
                xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            xmlhttp.onreadystatechange = function() {
                if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                    var data = JSON.parse(xmlhttp.responseText);
                    var friends = data.friends;
                    var html = '';
                    for (var i = 0; i < friends.length; i++) {
                        var name = friends[i].name;
                        var age = friends[i].age;
                        var sex = friends[i].sex;
                        html += '<p>' + name + ' (' + sex + ', ' + age + ')</p>';
                    }
                    document.getElementById("content").innerHTML = html;
                }
            }
            xmlhttp.open("GET", "friends.json", true);
            xmlhttp.send();
        }
    </script>
</head>
<body>

<h2>Friends List</h2>

<button onclick="loadJSONDoc()">Get Friends</button>

<div id="content"></div>

</body>
</html>

以上就是使用php+Ajax处理xml与json格式数据的方法示例的完整攻略，希望能对你有所帮助。

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