php操作xml文件,xml与array互转

灰太狼 2023-06-06 15:27 86阅读 0赞

### 1.SimpleXMLElement ###

简单轻便，读取，追加，查找，保存：

•SimpleXMLElement::addAttribute — Adds an attribute to the SimpleXML element
    •SimpleXMLElement::addChild — Adds a child element to the XML node
    •SimpleXMLElement::asXML — Return a well-formed XML string based on SimpleXML element
    •SimpleXMLElement::attributes — Identifies an element's attributes
    •SimpleXMLElement::children — Finds children of given node
    •SimpleXMLElement::__construct — Creates a new SimpleXMLElement object
    •SimpleXMLElement::count — Counts the children of an element
    •SimpleXMLElement::getDocNamespaces — Returns namespaces declared in document
    •SimpleXMLElement::getName — Gets the name of the XML element
    •SimpleXMLElement::getNamespaces — Returns namespaces used in document
    •SimpleXMLElement::registerXPathNamespace — Creates a prefix/ns context for the next XPath query
    •SimpleXMLElement::saveXML — 别名 SimpleXMLElement::asXML
    •SimpleXMLElement::__toString — Returns the string content
    •SimpleXMLElement::xpath — Runs XPath query on XML data

### 2.DOMDocument ###

方法更多，可转换成html类型等。

•DOMDocument::__construct — Creates a new DOMDocument object
    •DOMDocument::createAttribute — Create new attribute
    •DOMDocument::createAttributeNS — Create new attribute node with an associated namespace
    •DOMDocument::createCDATASection — Create new cdata node
    •DOMDocument::createComment — Create new comment node
    •DOMDocument::createDocumentFragment — Create new document fragment
    •DOMDocument::createElement — Create new element node
    •DOMDocument::createElementNS — Create new element node with an associated namespace
    •DOMDocument::createEntityReference — Create new entity reference node
    •DOMDocument::createProcessingInstruction — Creates new PI node
    •DOMDocument::createTextNode — Create new text node
    •DOMDocument::getElementById — Searches for an element with a certain id
    •DOMDocument::getElementsByTagName — Searches for all elements with given local tag name
    •DOMDocument::getElementsByTagNameNS — Searches for all elements with given tag name in specified namespace
    •DOMDocument::importNode — Import node into current document
    •DOMDocument::load — Load XML from a file
    •DOMDocument::loadHTML — Load HTML from a string
    •DOMDocument::loadHTMLFile — Load HTML from a file
    •DOMDocument::loadXML — Load XML from a string
    •DOMDocument::normalizeDocument — Normalizes the document
    •DOMDocument::registerNodeClass — Register extended class used to create base node type
    •DOMDocument::relaxNGValidate — Performs relaxNG validation on the document
    •DOMDocument::relaxNGValidateSource — Performs relaxNG validation on the document
    •DOMDocument::save — Dumps the internal XML tree back into a file
    •DOMDocument::saveHTML — Dumps the internal document into a string using HTML formatting
    •DOMDocument::saveHTMLFile — Dumps the internal document into a file using HTML formatting
    •DOMDocument::saveXML — Dumps the internal XML tree back into a string
    •DOMDocument::schemaValidate — Validates a document based on a schema
    •DOMDocument::schemaValidateSource — Validates a document based on a schema
    •DOMDocument::validate — Validates the document based on its DTD
    •DOMDocument::xinclude — Substitutes XIncludes in a DOMDocument Object

#### 美化xml格式： ####

<?php
    $xml = simplexml_load_file('example.xml'); //读取 XML数据
    echo $xml->asXML(); //标准化 XML数据

#### DOMDocument 追加节点 ####

<?php
    
    $doc = new DOMDocument('1.0', 'UTF-8');
    // we want a nice output
    $doc->formatOutput = true;
    
    $root = $doc->createElement('book');
    $root = $doc->appendChild($root);
    
    $title = $doc->createElement('title');
    $title = $root->appendChild($title);
    
    $text = $doc->createTextNode('This is the title');
    $text = $title->appendChild($text);
    
    echo "Saving all the document:\n";
    echo $doc->saveXML() . "\n";
    
    echo "Saving only the title part:\n";
    echo $doc->saveXML($title);

在线XML/JSON互相转换工具：  
http://tools.jb51.net/code/xmljson

在线格式化XML/在线压缩XML：  
http://tools.jb51.net/code/xmlformat

XML在线压缩/格式化工具：  
http://tools.jb51.net/code/xml\_format\_compress

### xml与Array互转： ###

<?php
    //数组转XML
    function arrayToXml($data, &$xml_data) { 
        foreach ($data as $key => $value) { 
            if (is_numeric($key)) { 
                $key = 'item' . $key; //dealing with <0/>..<n/> issues
            }
            if (is_array($value)) { 
                $subnode = $xml_data->addChild($key);
                arrayToXml($value, $subnode);
            } else { 
                $xml_data->addChild("$key", htmlspecialchars("$value"));
            }
        }
    }
    
    function array2Xml($array, $rootElement = null, $xml = null) { 
        // If there is no Root Element then insert root
        $version = '<?xml version="1.0" encoding="UTF-8"?>';
        $rootElement = $version . (empty($rootElement) ? '<root/>' : $rootElement);
        if ($xml === null) { 
            $xml = new SimpleXMLElement($rootElement);
        }
    
        // Visit all key value pair
        foreach ($array as $k => $v) { 
            // If there is nested array then
            if (is_array($v)) { 
                // Call function for nested array
                array2Xml($v, $k, $xml->addChild($k));
            } else { 
                // Simply add child element.
                $xml->addChild($k, $v);
            }
        }
        return $xml->asXML();
    }
    
    //将XML转为array
    function xmlToArray($xml) { 
        //禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $values = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $values;
    }
    
    $arr = ['name' => '阳水平', 'age' => 12, 'cc' => ['web' => 'nbfu.com', 'code' => 'nbfu.code', 'dd' => ['aa' => 'aaa.com']]];
    // creating object of SimpleXMLElement
    $xml_data = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><data></data>');
    // function call to convert array to xml
    arrayToXml($arr, $xml_data);
    $xml_string = $xml_data->asXML();
    print_r($xml_string);
    
    // xml to array marked by yangshuiping
    print_r(xmlToArray($xml_string));
    
    // 第二种放方法 marked by yangshuiping
    print_r(array2Xml($arr));