


A brief discussion on how to use PHP to access and operate DOM (1)_PHP Tutorial
The DOM tree defines the logical structure of documents and controls how you access and manipulate these documents. Using the DOM, developers can create XML or HTML documents, manipulate their results, and add, modify, and delete document elements and content. The DOM can be accessed from any programming language. This article uses the PHP 5 DOM extension, which is part of the PHP core, so there is no need to install other software besides PHP.
DOM tree nodes follow XML naming conventions, such as:
1. Document node--represents the DOMDocument interface
2. Element node--represents the DOMElement interface
3. Attribute node--represents the DOMAttr interface
4. Comment node--represents the DOMComment interface
5. Text node--represents the DOMText interface
Extracting elements
This section introduces how to extract elements and values from the DOM tree. This article uses Book.xml as an example to illustrate, and its content is shown in Listing 1.
List 1 Book.xml
<ol class="dp-xml"> <li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-" name>xml</span></font></strong><span> </span><span class="attribute"><font color="#ff0000">version</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"1.0"</font></span><span> </span><span class="attribute"><font color="#ff0000">encoding</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"UTF-8"</font></span><span> </span><span class="attribute"><font color="#ff0000">standalone</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"yes"</font></span><span> </span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span></span></li> <li> <span></span><strong><font color="#006699"><span class="tag"><span class="tag-" name>book</span><span class="tag">></span></span></font></strong><span> </span> </li> <li class="alt"> <span></span><span class="comments"><font color="#008200"><!--XML Processing [part I] --></font></span><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-" name>name</span><span class="tag">></span></span></font></strong><span>XML Processing I</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">name</span><span class="tag">></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">author</span><span class="tag">></span></span></font></strong><span>John Smith Jr.</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">author</span><span class="tag">></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">publisher</span><span class="tag">></span></span></font></strong><span>HisOwnTM</span><strong><font color="#006699"><span class="tag"></span><span class="tag-" name>publisher</span><span class="tag">></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">ISBN</span><span class="tag">></span></span></font></strong><span>111-222-333-4441</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">ISBN</span><span class="tag">></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">contents</span><span class="tag">></span></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-" name>chapter_I</span><span class="tag">></span></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">title</span><span class="tag">></span></span></font></strong><span>What is XML about ?</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">title</span><span class="tag">></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-" name>content</span><span class="tag">></span></span></font></strong><span>XML (Extensible Markup Language) is a ...</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">content</span><span class="tag">></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">chapter_I</span><span class="tag">></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-" name>chapter_II</span><span class="tag">></span></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">title</span><span class="tag">></span></span></font></strong><span>SAX</span><strong><font color="#006699"><span class="tag"></span><span class="tag-" name>title</span><span class="tag">></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-" name>content</span><span class="tag">></span></span></font></strong><span>SAX is a simple API for ...</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">content</span><span class="tag">></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">chapter_II</span><span class="tag">></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-" name>chapter_III</span><span class="tag">></span></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">title</span><span class="tag">></span></span></font></strong><span>StAX</span><strong><font color="#006699"><span class="tag"></span><span class="tag-" name>title</span><span class="tag">></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-" name>content</span><span class="tag">></span></span></font></strong><span>Much powerful and flexible, StAX, is very...</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">content</span><span class="tag">></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">chapter_III</span><span class="tag">></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-" name>chapter_IV</span><span class="tag">></span></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">title</span><span class="tag">></span></span></font></strong><span>DOM </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">subtitle</span><span class="tag">></span></span></font></strong><span>DOM concept </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">continut</span><span class="tag">></span></span></font></strong><span>Starting to use DOM...</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">continut</span><span class="tag">></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"></span><span class="tag">subtitle</span><span class="tag">></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">subchapter_IV_I</span><span class="tag">></span></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">title</span><span class="tag">></span></span></font></strong><span>First DOM application...</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">title</span><span class="tag">></span></font></strong><span> </span> </li> <li> <span> </span><st rong><font color="#006699"><span class="tag"><span class="tag-name">content</span><span class="tag">></span></span></font><span>Here it is your first DOM application...</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">content</span><span class="tag">></span></font></strong><span> </span><li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"></span><span class="tag">subchapter_IV_I</span><span class="tag">></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">title</span><span class="tag">></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"></span><span class="tag-" name>chapter_IV</span><span class="tag">></span></font></strong><span> </span> </li> <li> <span> </span><strong><font color="#006699"><span class="tag"><span class="tag-" name>end</span><span class="tag">></span></span></font></strong><span>The end...</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">end</span><span class="tag">></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">contents</span><span class="tag">></span></font></strong><span> </span> </li> <li> <span></span><span class="comments"><font color="#008200"><!-- See you in XML Processing [part II] --></font></span><span> </span> </li> <li class="alt"> <span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">book</span><span class="tag">></span></font></strong><span> </span> </li></st> </li> </ol>
First download the PHP code compression package used in this article,

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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