In web development, DOM (Document Object Model) is a very important concept. It allows developers to easily modify and operate the HTML or XML document of a web page, such as adding, deleting, modifying elements, etc. The built-in DOM operation library in PHP also provides developers with rich functions. This article will introduce the DOM operation guide in PHP, hoping to help everyone.
- The basic concept of DOM
DOM is a cross-platform, language-independent API that can represent XML or HTML documents as a tree structure, in which each Nodes are all objects, and there is a parent-child relationship between objects. This tree structure allows developers to easily traverse and manipulate documents.
In DOM, each element in the web document is represented as a node. Nodes can be divided into several types such as element nodes, text nodes, comment nodes and attribute nodes. Developers can access and modify the content of nodes through the node's name, attributes, sub-nodes, etc.
- Usage of DOM extension library
In PHP, the DOM extension library provides a set of commonly used APIs that can help developers easily manipulate and modify HTML or XML document. Some of the commonly used APIs are as follows:
(1) Create a DOM document object
Before using the DOM extension library for document operations, you must first create a DOM document object. This can be achieved through the DOMDocument class:
$doc=new DOMDocument();
(2) Reading XML or HTML documents
You can use the load() or loadHTML() method of the DOMDocument class to read XML or HTML documents, for example :
$doc->load("example.xml");(3) Traverse document nodes
You can use the methods provided by the DOMDocument class to traverse document nodes, for example:
$root=$doc->getElementsByTagName("root")->item(0);
foreach($root->childNodes as $child){
//處理子節(jié)點(diǎn)
}(4) Add and delete nodes
You can use the methods provided by the DOMDocument class to add and delete nodes, for example:
//添加一個(gè)元素節(jié)點(diǎn)
$newElement=$doc->createElement("newElement");
$root->appendChild($newElement);
//刪除一個(gè)元素節(jié)點(diǎn)
$oldElement=$doc->getElementsByTagName("oldElement")->item(0);
$oldElement->parentNode->removeChild($oldElement);(5) Find nodes
You can use the methods provided by the DOMDocument class to find nodes, for example:
//通過(guò)標(biāo)簽名查找元素節(jié)點(diǎn)
$elements=$doc->getElementsByTagName("example");
foreach($elements as $element){
//處理元素節(jié)點(diǎn)
}
//通過(guò)屬性值查找元素節(jié)點(diǎn)
$elements=$doc->getElementsByAttribute("id","exampleId");
foreach($elements as $element){
//處理元素節(jié)點(diǎn)
}(6) Modify node content
You can use the methods provided by the DOMElement class to modify the node content, for example:
//修改元素節(jié)點(diǎn)的文本內(nèi)容
$element=$doc->getElementsByTagName("example")->item(0);
$element->textContent="new text";
//修改元素節(jié)點(diǎn)的屬性值
$element=$doc->getElementsByTagName("example")->item(0);
$element->setAttribute("attrName","attrValue");- Practical combat of DOM operations
Here, we will introduce some practical DOM operations so that developers can better understand the application of DOM operations.
(1) Replace an element node
In the following example, we will use DOM operations to replace an element node with another new element node:
$doc=new DOMDocument();
$doc->load("example.xml");
$root=$doc->getElementsByTagName("root")->item(0);
$newElement=$doc->createElement("newElement");
$oldElement=$doc->getElementsByTagName("oldElement")->item(0);
$root->replaceChild($newElement,$oldElement);(2) Find an element node
In the following example, we will use DOM operations to find an element node with a specified name:
$doc=new DOMDocument();
$doc->load("example.xml");
$elements=$doc->getElementsByTagName("example");
foreach($elements as $element){
//處理元素節(jié)點(diǎn)
}(3) Add an element node
In the following example, we will use DOM operations to add a new element node to the specified position:
$doc=new DOMDocument();
$doc->load("example.xml");
$root=$doc->getElementsByTagName("root")->item(0);
$newElement=$doc->createElement("newElement");
$insertBefore=$doc->getElementsByTagName("insertBefore")->item(0);
$root->insertBefore($newElement,$insertBefore);- Summary
This article introduces PHP DOM operation guide, including the concept of DOM, the use of DOM API and practical applications. The powerful functions of DOM can help developers easily modify and operate HTML or XML documents and improve development efficiency, which is very valuable for web developers. I hope this article can help developers who need to learn DOM operations.
The above is the detailed content of DOM manipulation guide in PHP. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How to use PHP to build social sharing functions PHP sharing interface integration practice
Jul 25, 2025 pm 08:51 PM
The core method of building social sharing functions in PHP is to dynamically generate sharing links that meet the requirements of each platform. 1. First get the current page or specified URL and article information; 2. Use urlencode to encode the parameters; 3. Splice and generate sharing links according to the protocols of each platform; 4. Display links on the front end for users to click and share; 5. Dynamically generate OG tags on the page to optimize sharing content display; 6. Be sure to escape user input to prevent XSS attacks. This method does not require complex authentication, has low maintenance costs, and is suitable for most content sharing needs.
How to use PHP combined with AI to achieve text error correction PHP syntax detection and optimization
Jul 25, 2025 pm 08:57 PM
To realize text error correction and syntax optimization with AI, you need to follow the following steps: 1. Select a suitable AI model or API, such as Baidu, Tencent API or open source NLP library; 2. Call the API through PHP's curl or Guzzle and process the return results; 3. Display error correction information in the application and allow users to choose whether to adopt it; 4. Use php-l and PHP_CodeSniffer for syntax detection and code optimization; 5. Continuously collect feedback and update the model or rules to improve the effect. When choosing AIAPI, focus on evaluating accuracy, response speed, price and support for PHP. Code optimization should follow PSR specifications, use cache reasonably, avoid circular queries, review code regularly, and use X
PHP calls AI intelligent voice assistant PHP voice interaction system construction
Jul 25, 2025 pm 08:45 PM
User voice input is captured and sent to the PHP backend through the MediaRecorder API of the front-end JavaScript; 2. PHP saves the audio as a temporary file and calls STTAPI (such as Google or Baidu voice recognition) to convert it into text; 3. PHP sends the text to an AI service (such as OpenAIGPT) to obtain intelligent reply; 4. PHP then calls TTSAPI (such as Baidu or Google voice synthesis) to convert the reply to a voice file; 5. PHP streams the voice file back to the front-end to play, completing interaction. The entire process is dominated by PHP to ensure seamless connection between all links.
PHP creates a blog comment system to monetize PHP comment review and anti-brush strategy
Jul 25, 2025 pm 08:27 PM
1. Maximizing the commercial value of the comment system requires combining native advertising precise delivery, user paid value-added services (such as uploading pictures, top-up comments), influence incentive mechanism based on comment quality, and compliance anonymous data insight monetization; 2. The audit strategy should adopt a combination of pre-audit dynamic keyword filtering and user reporting mechanisms, supplemented by comment quality rating to achieve content hierarchical exposure; 3. Anti-brushing requires the construction of multi-layer defense: reCAPTCHAv3 sensorless verification, Honeypot honeypot field recognition robot, IP and timestamp frequency limit prevents watering, and content pattern recognition marks suspicious comments, and continuously iterate to deal with attacks.
PHP realizes commodity inventory management and monetization PHP inventory synchronization and alarm mechanism
Jul 25, 2025 pm 08:30 PM
PHP ensures inventory deduction atomicity through database transactions and FORUPDATE row locks to prevent high concurrent overselling; 2. Multi-platform inventory consistency depends on centralized management and event-driven synchronization, combining API/Webhook notifications and message queues to ensure reliable data transmission; 3. The alarm mechanism should set low inventory, zero/negative inventory, unsalable sales, replenishment cycles and abnormal fluctuations strategies in different scenarios, and select DingTalk, SMS or Email Responsible Persons according to the urgency, and the alarm information must be complete and clear to achieve business adaptation and rapid response.
How to use PHP to combine AI to generate image. PHP automatically generates art works
Jul 25, 2025 pm 07:21 PM
PHP does not directly perform AI image processing, but integrates through APIs, because it is good at web development rather than computing-intensive tasks. API integration can achieve professional division of labor, reduce costs, and improve efficiency; 2. Integrating key technologies include using Guzzle or cURL to send HTTP requests, JSON data encoding and decoding, API key security authentication, asynchronous queue processing time-consuming tasks, robust error handling and retry mechanism, image storage and display; 3. Common challenges include API cost out of control, uncontrollable generation results, poor user experience, security risks and difficult data management. The response strategies are setting user quotas and caches, providing propt guidance and multi-picture selection, asynchronous notifications and progress prompts, key environment variable storage and content audit, and cloud storage.
Beyond the LAMP Stack: PHP's Role in Modern Enterprise Architecture
Jul 27, 2025 am 04:31 AM
PHPisstillrelevantinmodernenterpriseenvironments.1.ModernPHP(7.xand8.x)offersperformancegains,stricttyping,JITcompilation,andmodernsyntax,makingitsuitableforlarge-scaleapplications.2.PHPintegrateseffectivelyinhybridarchitectures,servingasanAPIgateway
PHP integrated AI speech recognition and translator PHP meeting record automatic generation solution
Jul 25, 2025 pm 07:06 PM
Select the appropriate AI voice recognition service and integrate PHPSDK; 2. Use PHP to call ffmpeg to convert recordings into API-required formats (such as wav); 3. Upload files to cloud storage and call API asynchronous recognition; 4. Analyze JSON results and organize text using NLP technology; 5. Generate Word or Markdown documents to complete the automation of meeting records. The entire process needs to ensure data encryption, access control and compliance to ensure privacy and security.
