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  • What is a static variable inside a PHP function?
    What is a static variable inside a PHP function?
    AstaticvariableinPHPretainsitsvaluebetweenfunctioncalls.Declaredwiththestatickeywordinsideafunction,itisinitializedonlyonceandpreservesitsstateacrosssubsequentcalls.Forexample,acounterfunctionusingastaticvariableincrementscorrectlyeachtimeit’scalled,
    PHP Tutorial . Backend Development 291 2025-07-14 01:39:51
  • Animating elements with css transitions and keyframes
    Animating elements with css transitions and keyframes
    The key to improving user experience in CSS animation is to choose transition and @keyframes reasonably. 1. Transition is suitable for simple state changes, such as button hover effect, which is achieved by defining attributes, duration, delay and speed curves; 2. @keyframes is suitable for complex animation sequences, such as loading animations, which controls the state of elements at different time points through multiple keyframes. Usage tips include: prioritizing the use of transform and opacity to improve performance, ensuring the initial consistency is consistent with the target state, and setting the ease function reasonably. Frequently asked questions: enable hardware acceleration in a timely manner and reduce nesting, check the property name and initial value when the transition does not take effect, and repeat animation playback can be performed through inf
    CSS Tutorial . Web Front-end 766 2025-07-14 01:39:20
  • Implementing responsive design approaches: mobile-first vs desktop-first in css
    Implementing responsive design approaches: mobile-first vs desktop-first in css
    Mobile-first and desktop-first have their own applicable scenarios, and the selection needs to be based on project needs. 1. mobile-first first writes the mobile style, and then adapts to the large screen through min-width media query, which is suitable for mobile phone-first projects, such as e-commerce front desk; 2. desktop-first first designs for desktops, using max-width media query to adapt to small screens, which is suitable for desktop-first products such as background management systems; 3. The core difference between the two is that the media query direction is different. The former expands from small screen to large screen, and the latter shrinks from large screen to small screen; 4. In either way, you need to add a viewport meta tag to ensure normal display of the mobile terminal; 5. mobile
    CSS Tutorial . Web Front-end 382 2025-07-14 01:33:31
  • php get current date
    php get current date
    The most common method to get the current date in PHP is to use the date() function, such as echodate("Y-m-dH:i:s") to output the full date and time; if only the date is required, it can be written as echodate("Y-m-d"); if you need a more friendly format, you can use echodate("l,Fj,Y") to output the English date; for complex scenarios, it is recommended to use the DateTime class, such as $date=newDateTime() and get the formatting time through $date->format("Y-m-dH:i:s");
    PHP Tutorial . Backend Development 796 2025-07-14 01:29:11
  • How to create a simple image gallery in HTML?
    How to create a simple image gallery in HTML?
    To create a simple image gallery on a web page, use HTML and CSS to do so. 1. Use div to wrap multiple img tags to build the basic structure; 2. Use flex or grid layout to display pictures side by side, and set gap control spacing; 3. Add hover effects to improve the interactive experience, such as border changes and image enlargement; 4. Optional responsive design to adapt to different screen sizes.
    HTML Tutorial . Web Front-end 768 2025-07-14 01:25:21
  • mysql now() vs current_timestamp()
    mysql now() vs current_timestamp()
    The main difference between NOW() and CURRENT_TIMESTAMP() is in the usage scenario; CURRENT_TIMESTAMP can be used as the column default value and automatically update keywords, while NOW() is only a function; both return the same result in the query, but when defining the table structure, you must use CURRENT_TIMESTAMP to set the default value or automatically update the timestamp.
    Mysql Tutorial . Database 496 2025-07-14 01:23:21
  • Controlling content overflow with CSS overflow property options
    Controlling content overflow with CSS overflow property options
    TheCSSoverflowpropertycontrolshowcontentishandledwhenitoverflowsitscontainer,withvalueslikevisible,hidden,scroll,andauto.1.visibleallowscontenttospilloutbydefault;2.hiddenclipsoverflowcontent;3.scrolladdspermanentscrollbars;4.autoshowsscrollbarsonlyw
    CSS Tutorial . Web Front-end 984 2025-07-14 01:17:00
  • Connecting External Applications to MySQL Databases
    Connecting External Applications to MySQL Databases
    ToconnectexternalapplicationstoMySQLsecurely,firstenableremoteaccessbychangingthebind-addressto0.0.0.0inmy.cnf/my.ini,thengrantremoteaccessviaGRANTcommandandflushprivileges.2)Ensurethefirewallallowstrafficonport3306.3)Usethecorrectconnectionstringiny
    Mysql Tutorial . Database 835 2025-07-14 01:16:41
  • mysql command line client tips
    mysql command line client tips
    Mastering common techniques of MySQL command line can improve operation efficiency; configuring default login information can quickly enter the database interface; using up and down keys or systemhistory to view historical commands, the Tab key will automatically complete the table name field; using \G vertically display results and pagermore pagination display; using shortcut commands such as \s to view connection status, \c cancel statement, \g execution statement, and \h to obtain help documents.
    Mysql Tutorial . Database 160 2025-07-14 01:01:21
  • How to create a custom session handler in PHP?
    How to create a custom session handler in PHP?
    In PHP, custom session processing mechanism requires implementing the SessionHandlerInterface interface and registering handler. 1. Implement six core methods: open(), close(), read(), write(), destroy() and gc() to complete the session storage logic; 2. Create a custom handler class instance and register it through session_set_save_handler(); 3. Call session_start() before use to start the session. Suitable for improving performance, centralized management and extension functions. It is recommended to pay attention to permission control, concurrency problems and security protection to ensure the correct operation of GC and ensure the sess
    PHP Tutorial . Backend Development 942 2025-07-14 00:58:20
  • How to optimize database queries within a PHP context?
    How to optimize database queries within a PHP context?
    TooptimizePHPdatabasequeries,focusonimprovingperformancethroughindexing,limitingfetcheddata,batchingqueries,andstrategiccaching.1)Useindexeswiselybyapplyingthemtofrequentlysearchedcolumnsandcompositeindexesformulti-conditionqueries,whileavoidingover-
    PHP Tutorial . Backend Development 871 2025-07-14 00:49:51
  • Best practices for designing relational schemas in MySQL
    Best practices for designing relational schemas in MySQL
    The key to designing the MySQL database model lies in clear logic and reasonable structure, which directly affects query efficiency and maintenance costs. 1. Correctly use primary and foreign key constraints to ensure data integrity and avoid orphan records; 2. Reasonably select field types and lengths to save storage space and improve performance; 3. Establish appropriate indexes to improve query speed, but avoid abuse; 4. Balance normalization and anti-normalization, taking into account consistency and query performance.
    Mysql Tutorial . Database 157 2025-07-14 00:49:31
  • PHP prepared statement named parameters example
    PHP prepared statement named parameters example
    Named parameters improve code readability and maintenance in PHP preprocessing statements. 1. Use the name placeholder to make the parameter order irrelevant and reusable; 2. PDO extension supports naming parameters, and binds values through bindValue() or execute(); 3. Execute() can be directly passed into the associative array to achieve a more concise writing method; 4. Notes include that parameter names must start with a colon, avoid mixed question mark placeholders, and ensure that the parameter names are spelled correctly.
    PHP Tutorial . Backend Development 337 2025-07-14 00:49:11
  • How to embed a YouTube video in HTML?
    How to embed a YouTube video in HTML?
    To embed YouTube videos in web pages, just copy and paste the code provided by YouTube. First, open the target video, click the "Share" button, select "Embed" and copy the HTML code that appears, including the key src address and optional parameters such as allowfullscreen, autoplay, etc. Then paste the code in the appropriate location in the HTML file. If you use Jekyll or WordPress, you can also insert it into the custom HTML module. Finally, adjust the size, set a responsive design or add automatic playback parameters as needed?autoplay=1, note that the browser may restrict automatic playback with sound. Simple operation but attention should be paid to details to ensure complete functions and user body
    HTML Tutorial . Web Front-end 916 2025-07-14 00:48:12

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