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  • Managing Memory Leaks in Long-Running PHP `while` Scripts
    Managing Memory Leaks in Long-Running PHP `while` Scripts
    Unsetlargevariablesafterusetopreventaccumulation;2.Callgc_collect_cycles()periodicallytohandlecircularreferences;3.Avoidgrowingstaticorglobalarraysbyloggingexternallyorlimitingbuffersize;4.Breakloopsintochunksandresetstateeveryfewiterationstosimulate
    PHP Tutorial . Backend Development 928 2025-08-02 09:39:02
  • How to group columns in an HTML table with
    How to group columns in an HTML table with
    Yes, columns in HTML tables can be grouped using and elements. 1. It must be followed immediately after the tag to define the style or attribute of the column; 2. Use the span attribute to set the same style for multiple columns at once, such as background color or alignment; 3. Each column in the table in order can be set separately, width, color, etc.; 4. Support mixing spans and independent control of different columns to flexibly control different columns; 5. It is only used to set rendering and structure attributes, and cannot contain content, but it can significantly improve code maintainability and style efficiency, and is well supported in all modern and old browsers.
    HTML Tutorial . Web Front-end 150 2025-08-02 09:36:02
  • Mastering Loop Control: A Deep Dive into the PHP `break` Statement
    Mastering Loop Control: A Deep Dive into the PHP `break` Statement
    ThebreakstatementinPHPexitstheinnermostlooporswitch,andcanoptionallyexitmultiplenestedlevelsusinganumericargument;1.breakstopsthecurrentlooporswitch,2.breakwithanumber(e.g.,break2)exitsthatmanyenclosingstructures,3.itisusefulforefficiencyandcontrolin
    PHP Tutorial . Backend Development 784 2025-08-02 09:28:01
  • What are CSS container queries and how to use them?
    What are CSS container queries and how to use them?
    CSScontainerqueriesallowstylingbasedonacontainer'ssize,nottheviewport.2.Defineacontainerusingcontainer-type:inline-size.3.Use@containerrulesinchildelementstoapplystyles.4.Benefitsincludecomponent-levelresponsiveness,reusability,andbetterdesignsystems
    CSS Tutorial . Web Front-end 267 2025-08-02 09:07:01
  • Preserving Numeric Keys: The Challenge of Deleting from Indexed Arrays
    Preserving Numeric Keys: The Challenge of Deleting from Indexed Arrays
    To delete elements while retaining the original numeric keys, you should avoid using functions that will automatically re-index. 1. Use unset() or array_filter() in PHP with ARRAY_FILTER_USE_KEY; 2. Use delete operator instead of splice() or filter() in JavaScript; 3. Prefer structures such as associative arrays, objects or maps; 4. If re-index is necessary, the original key should be stored separately; the key is to select appropriate data structures and operation methods according to the needs to ensure that the integrity of the key is maintained.
    PHP Tutorial . Backend Development 317 2025-08-02 09:00:02
  • Mastering Indexed vs. Associative Array Creation in PHP
    Mastering Indexed vs. Associative Array Creation in PHP
    Indexedarraysusenumerickeysstartingfrom0,whileassociativearraysusenamedstringkeys;indexedarraysarecreatedwith$array=['value1','value2']andautomaticallyassignintegers,whereasassociativearraysuse$array=['key'=>'value']formeaningfullabels;PHPpreserve
    PHP Tutorial . Backend Development 153 2025-08-02 08:55:01
  • How to disable user selection of text with CSS?
    How to disable user selection of text with CSS?
    To disable user selection text, you can use the user-select attribute of CSS; the specific steps are: 1. Use the .user-select{user-select:none;} rule; 2. Add manufacturer prefixes to compatible old browsers, including -webkit-user-select:none (Safari), -moz-user-select:none (Firefox), -ms-user-select:none (IE/Edge); 3. Apply the class to HTML elements so the text is not selectable; it should be noted that this method only takes effect on the client and cannot prevent the copying of content through developer tools, and it should be avoided to be overly involved in regular content.
    CSS Tutorial . Web Front-end 191 2025-08-02 08:51:00
  • Implementing MySQL Database Cloning for DevOps
    Implementing MySQL Database Cloning for DevOps
    MySQL database cloning can be implemented in four ways. 1. Use mysqldump for logical cloning, export SQL scripts and import into the target database, suitable for small databases and support exclusion of tables and compression transmission; 2. Use file system snapshots for physical cloning, suitable for large databases, freezing instances, creating snapshots and copying files, requiring the source and target configuration to be consistent; 3. Set up a continuous cloning environment through replication, configure master-slave replication to achieve data synchronization, suitable for scenarios that require real-time updates; 4. Automatic cloning in the CI/CD pipeline, use scripts, Docker or tools to integrate automation processes, and it is recommended to regularly clean up, data desensitize, and naming specifications.
    Mysql Tutorial . Database 707 2025-08-02 08:45:02
  • What is the HTML details and summary element
    What is the HTML details and summary element
    Theandelementscreateacollapsiblecontainerwherewrapsthecontentandprovidestheclickablelabel;2.Bydefault,thecontentiscollapsed,andclickingthesummaryexpandsorcollapsesit;3.Theopenattributemakesthedetailssectionexpandedinitially;4.Theseelementsarenatively
    HTML Tutorial . Web Front-end 420 2025-08-02 08:24:03
  • How to create a CSS-only animated social media icons?
    How to create a CSS-only animated social media icons?
    Creating animated social icons using pure CSS can be achieved through HTML structure and CSS animation; 2. Define each social platform icon with class name in HTML and introduce FontAwesome; 3. Use Flexbox to layout and set a unified icon style, including size, rounded corners, shadows and transition effects; 4. Specify brand colors for each platform, and Instagram uses linear gradient background; 5. Add scaling, displacement, rotation and shadows to enhance interaction through:hover pseudo-class; 6. Optionally add luminous or rippling animations to improve visual effects; 7. Ensure accessibility and add aria-label, ensure responsiveness and high performance, and ultimately achieve smooth animation icons without JavaScript.
    CSS Tutorial . Web Front-end 523 2025-08-02 08:19:00
  • Is Your PHP Switch a Code Smell? Identifying and Refactoring Anti-Patterns
    Is Your PHP Switch a Code Smell? Identifying and Refactoring Anti-Patterns
    Yes, the switch statement in PHP itself is not a code smell, but when it is repeated in multiple files, contains too many branches, is tightly coupled with business logic, violates the principle of single responsibility, or makes judgments based on object types, it becomes an anti-pattern; 1. Use policy mode processing factory: define processing interfaces and concrete classes, map types to processors through factory mapping, add new types only requires registration and no modification of existing code; 2. Use class-based distribution (polymorphism): let the object itself determine behavior, implement concrete logic by inheriting abstract classes, and directly execute methods when calling without switching; 3. Use closure mapping (suitable for simple scenarios): Use associative arrays to store the mapping of type to closures, avoid branch structure but are less testable; 4. PHP8 can be used
    PHP Tutorial . Backend Development 235 2025-08-02 08:00:06
  • Implementing MySQL Cross-Region Disaster Recovery
    Implementing MySQL Cross-Region Disaster Recovery
    The core of cross-regional disaster recovery is to ensure business continuity through data replication and automatic switching. 1. Data replication methods include asynchronous replication (the best performance but may lose data), semi-synchronous replication (balanced consistency and availability) and group replication (high availability but high complexity), and are selected according to data tolerance; 2. Network delay and bandwidth affect replication efficiency, and it is recommended to compress transmission, merge transactions, and monitor delays; 3. The switching strategy is divided into manual and automatic, and automatic switching requires health checks and drills to avoid missed switching; 4. The multi-active architecture is a hot backup, which can be switched at any time but has high cost. Cold backup is suitable for non-core systems and has a long recovery time.
    Mysql Tutorial . Database 696 2025-08-02 07:58:01
  • How to create a fixed header on scroll with CSS?
    How to create a fixed header on scroll with CSS?
    Use the position:fixed attribute of CSS to create a fixed header. 1. Set position:fixed, top:0, left:0 and width:100% for the header to fix it on the top of the window; 2. Set z-index:1000 to ensure that the header is above other content; 3. Add padding-top to the main content area, the value is equal to the header height to prevent the content from suddenly moving up due to the header's departure from the document flow; 4. Optionally use box-shadow and box-sizing:border-box in the header to optimize vision and layout; finally, the header is always topped as the page scrolls.
    CSS Tutorial . Web Front-end 558 2025-08-02 07:38:01
  • How to use the CSS prefers-reduced-motion media query?
    How to use the CSS prefers-reduced-motion media query?
    Use prefers-reduced-motion media query to detect whether the user wants to reduce animation motion; 2. Disable or simplify animation by setting animation:none or transition:none in @media(prefers-reduced-motion:reduce); 3. Common application scenarios include disabling rotation, fade in, sliding, automatic carousel and hover animation; 4. The best practice is to enable animation by default, turn off motion only when needed, and do not remove features; 5. This setting can be simulated in browser developer tools for testing, thereby improving the accessibility and inclusion of the website.
    CSS Tutorial . Web Front-end 114 2025-08-02 07:17:01

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