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  • Creating custom shapes with css clip-path
    Creating custom shapes with css clip-path
    Use the clip-path attribute of CSS to crop elements into custom shapes, such as triangles, circular notches, polygons, etc., without relying on pictures or SVGs. Its advantages include: 1. Supports a variety of basic shapes such as circle, ellipse, polygon, etc.; 2. Responsive adjustment and adaptable to mobile terminals; 3. Easy to animation, and can be combined with hover or JavaScript to achieve dynamic effects; 4. It does not affect the layout flow, and only crops the display area. Common usages are such as circular clip-path:circle (50pxatcenter) and triangle clip-path:polygon (50%0%, 100 0%, 0 0%). Notice
    CSS Tutorial . Web Front-end 182 2025-07-09 01:29:30
  • Implementing gradients as backgrounds in css
    Implementing gradients as backgrounds in css
    Key points for using CSS to implement gradient background include: 1. Select linear-gradient or radial-gradient function; 2. Set the direction, color and position, such as background:linear-gradient(tobottom,#ffffff,#e0e0e0) or background:radial-gradient(circle,#ffffff,#cccccc); 3. It is recommended to use gradients as background-image, and cooperate with background-repeat and background-size attributes; 4. Browser needs to be considered.
    CSS Tutorial . Web Front-end 689 2025-07-09 01:28:52
  • PHP mb_substr example
    PHP mb_substr example
    mb_substr is the correct choice to avoid garbled code when dealing with multi-byte characters such as Chinese. 1. It intercepts by characters rather than bytes to ensure that Unicode characters such as Chinese characters are not split; 2. It is recommended to clearly specify the encoding as UTF-8 when using it to avoid system differences; 3. It can combine functions such as mb_strlen and mb_strpos to achieve more reliable string operations; 4. Older versions of PHP need to enable mbstring extension, otherwise it may not work properly.
    PHP Tutorial . Backend Development 968 2025-07-09 01:27:11
  • Optimizing complex JOIN operations in MySQL
    Optimizing complex JOIN operations in MySQL
    TooptimizecomplexJOINoperationsinMySQL,followfourkeysteps:1)EnsureproperindexingonbothsidesofJOINcolumns,especiallyusingcompositeindexesformulti-columnjoinsandavoidinglargeVARCHARindexes;2)ReducedataearlybyfilteringwithWHEREclausesandlimitingselected
    Mysql Tutorial . Database 506 2025-07-09 01:26:40
  • What is the HTML Imports specification (and why was it deprecated)?
    What is the HTML Imports specification (and why was it deprecated)?
    HTMLImports is a deprecated modular loading mechanism that allows the use of its content in the current page by introducing external HTML files. 1. It was used to encapsulate component structures, styles and behaviors for reuse; 2. It was eliminated due to synchronous loading impacts performance, lack of module system support, inconsistent with the development direction of modern WebComponents, and the mainstream framework's shift to JS modularity; 3. Alternatives include using ESModules to define components in combination with ShadowDOM and CustomElements, or using the help of building tools to manage templates and component structures.
    HTML Tutorial . Web Front-end 819 2025-07-09 01:24:11
  • What are ARIA landmark roles (e.g., role='navigation')?
    What are ARIA landmark roles (e.g., role='navigation')?
    ARIAlandmarkroleshelpscreenreaderusersnavigatewebpagesectionsefficiently.1.Role="navigation"marksmenusorlinks,bestusedonelements.2.Role="main"identifiesprimarycontent,ideallyonceperpage.3.Role="search"definessearchforms,
    HTML Tutorial . Web Front-end 380 2025-07-09 01:23:11
  • How to change the session save path in PHP?
    How to change the session save path in PHP?
    To modify the session saving path of PHP, there are two methods: 1. Modify session.save_path in php.ini to implement global settings; 2. Use session_save_path() to set dynamically in the code. The first method requires editing the php.ini file, finding and modifying session.save_path to the specified directory, restarting the server after saving, and ensuring that the directory exists and has read and write permissions; the second method is suitable for a single application, using session_save_path() to set the absolute path before calling session_start(), which does not affect other projects. Notes include: Make sure the path is correct and readable
    PHP Tutorial . Backend Development 897 2025-07-09 01:19:01
  • Describe the Purpose of Traits in PHP
    Describe the Purpose of Traits in PHP
    In PHP, traits are used to solve the problem of code reuse between unrelated classes. When multiple unrelated classes need to share the same behavior, public methods can be encapsulated into trait and introduced with use to avoid inheritance redundancy or code replication; its advantage is to break through the PHP single inheritance limit and realize multi-source method inclusion; but abuse should be avoided to prevent increased maintenance difficulty.
    PHP Tutorial . Backend Development 338 2025-07-09 01:17:21
  • How to handle forms submission in HTML without a server?
    How to handle forms submission in HTML without a server?
    When there is no backend server, HTML form submission can still be processed through front-end technology or third-party services. Specific methods include: 1. Use JavaScript to intercept form submissions to achieve input verification and user feedback, but the data will not be persisted; 2. Use third-party serverless form services such as Formspree to collect data and provide email notification and redirection functions; 3. Use localStorage to store temporary client data, which is suitable for saving user preferences or managing single-page application status, but is not suitable for long-term storage of sensitive information.
    HTML Tutorial . Web Front-end 187 2025-07-09 01:14:32
  • Achieving perfect horizontal and vertical centering using CSS
    Achieving perfect horizontal and vertical centering using CSS
    Using Flexbox, absolute positioning combined with transform or Grid layout are the three main ways to achieve horizontal and vertical centering of elements. First, Flexbox can quickly center elements by setting the container to flex layout and using justify-content and align-items attributes; second, absolute positioning combined with transform attributes is suitable for modal boxes or prompt boxes, and then centering is achieved by setting top and left to 50% and then transferring (-50%,-50%) backwards; third, CSSGrid can complete centering through a line of place-items:center code, and can also control the alignment method separately. These three methods are suitable for each
    CSS Tutorial . Web Front-end 257 2025-07-09 01:12:21
  • mysql error 2002 can't connect to local mysql server
    mysql error 2002 can't connect to local mysql server
    The clear answer to MySQL error 2002 is that it fails to connect to the local MySQL server. The common reasons and solutions are as follows: 1. The MySQL service is not running. Check and start the service to check the logs; 2. When using localhost, go to the socket file path error, try to connect with 127.0.0.1 or specify the correct socket path; 3. Firewall or permission restrictions block the connection, check the bind-address configuration and port monitoring; 4. Database crashes or initialization fails, view the logs and repair or reinstall MySQL.
    Mysql Tutorial . Database 322 2025-07-09 01:10:21
  • mysql coalesce function
    mysql coalesce function
    The COALESCE function is used to return the first non-null value in the parameter list and is suitable for processing NULL data. 1. The basic usage is to replace the NULL value, such as replacing the empty field with the default contact method; 2. It can be used to set the default value in aggregate query to ensure that 0 is returned instead of NULL when there is no data; 3. It can be used in conjunction with other functions such as NULLIF and IFNULL to enhance data cleaning and logical judgment capabilities.
    Mysql Tutorial . Database 531 2025-07-09 01:09:11
  • is it necessary to use a php framework
    is it necessary to use a php framework
    Whether or not the PHP framework is necessary depends on project requirements and development habits. For medium and large projects, using frameworks can improve code quality and save development time because frameworks provide standardized structures (such as MVC mode), built-in common functions (such as database operations, routing, authentication), enhanced security (such as anti-SQL injection), and integrated auxiliary tools (such as cache, queues). 1. The advantages of the framework include: standardizing code structure, improving maintenance, accelerating development speed, enhancing security, and integrating common functions. 2. The situation where the framework is not used is: small or one-time project, high-performance requirements scenarios, and basic skills practice during the learning stage. 3. Use the framework to pay attention to: learning costs are high, flexibility is limited, and performance overhead is present. It is recommended to choose appropriate based on the project size and personal ability.
    PHP Tutorial . Backend Development 358 2025-07-09 01:08:11
  • Solving vertical alignment challenges with CSS methods
    Solving vertical alignment challenges with CSS methods
    There are three common methods to achieve vertical centering: 1. Use Flexbox to achieve centering by setting the display:flex, align-items and justify-content attributes of the container, which is suitable for most block-level layouts; 2. Use Grid layout, and implement two-dimensional centering through the display:grid and place-items attributes, which is suitable for complex layout scenarios; 3. Use absolute positioning transform to achieve independent element centering by positioning the center point of the element and reverse offset, which does not depend on the container type. When choosing, trade-offs should be made based on project requirements and browser compatibility, and avoid using mobile devices that support poor table-cell methods.
    CSS Tutorial . Web Front-end 461 2025-07-09 01:07:11

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