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  • Unraveling the Mystery of $_REQUEST: When GET, POST, and COOKIE Collide
    Unraveling the Mystery of $_REQUEST: When GET, POST, and COOKIE Collide
    $_REQUEST merges GET, POST and COOKIE data, but there are security and predictability risks; when the key conflicts, its override order is determined by variables_order or request_order in php.ini, and defaults to EGPCS, that is, POST overwrites GET and GET overwrites COOKIE; for example, when there are "user" parameters in GET, POST and COOKIE, the POST value wins; using $_REQUEST may lead to security vulnerabilities, unpredictable behavior and difficulty in testing; the best practice is to avoid using $_REQUEST, but should explicitly use $_GET, $_POST or $_C
    PHP Tutorial . Backend Development 884 2025-08-06 08:06:00
  • Making HTML Tables Responsive with CSS
    Making HTML Tables Responsive with CSS
    The methods to solve the problem of displaying HTML tables on small screens are: 1. Use horizontal scrolling containers to wrap divs and add overflow-x:auto to allow users to slide to view; 2. Use media queries to convert the table into a vertical list, and use data-label display headers to improve the reading experience; 3. Use CSSGrid or Flexbox to change the layout, so that the table becomes a vertical block structure on the small screen; 4. Hide secondary columns to reduce interference. These methods can be used alone or in combination to implement responsive tables.
    HTML Tutorial . Web Front-end 765 2025-08-06 07:27:02
  • How to use IF() and IFNULL() functions in MySQL queries?
    How to use IF() and IFNULL() functions in MySQL queries?
    The IF() function is used for conditional logic in MySQL, and returns true or false values according to conditions, such as converting order states 0 and 1 into "Pending" and "Completed"; 2. The IFNULL() function is used to process NULL values. If the expression is NULL, it returns a specified alternative value, which is often used to display empty discounts as 0; 3. You can use IF() and IFNULL() to implement complex logic, such as checking whether the mailbox exists first and then judging the verification status; 4. These functions are suitable for clauses such as SELECT and WHERE, but it should be noted that using in WHERE may affect index performance; 5. IF() and IFNULL() are MySQL-specific functions, providing concise conditional judgment and null value processing
    Mysql Tutorial . Database 217 2025-08-06 07:16:01
  • The Synergy of $_POST and $_FILES: Managing Form Fields Alongside File Uploads
    The Synergy of $_POST and $_FILES: Managing Form Fields Alongside File Uploads
    To process file upload and form data at the same time, you must use the POST method and set enctype="multipart/form-data"; 1. Make sure that the HTML form contains method="post" and enctype="multipart/form-data"; 2. Get text fields such as title and description through $_POST; 3. Access the detailed information of uploaded files through $_FILES; 4. Check $_FILES['field']['error'] to ensure that the upload is successful; 5. Verify the file size and type to prevent illegal uploading; 6. Use m
    PHP Tutorial . Backend Development 517 2025-08-06 06:38:00
  • From $_REQUEST to Request Objects: The Evolution of Input Handling in Modern Frameworks
    From $_REQUEST to Request Objects: The Evolution of Input Handling in Modern Frameworks
    Theshiftfrom$_REQUESTtorequestobjectsrepresentsamajorimprovementinPHPdevelopment.1.Requestobjectsabstractsuperglobalsintoaclean,consistentAPI,eliminatingambiguityaboutinputsources.2.Theyenhancesecuritybyenablingbuilt-infiltering,sanitization,andvalid
    PHP Tutorial . Backend Development 603 2025-08-06 06:37:01
  • How to create a responsive navigation bar with a dropdown menu?
    How to create a responsive navigation bar with a dropdown menu?
    To create a responsive navigation bar, you must first build an HTML structure containing logo, menu toggle buttons and navigation links; 2. Use CSS to set basic styles and implement responsive layouts, trigger the drop-down menu through:hover on the desktop, hide the menu on the mobile side and switch with the hamburger button; 3. Use JavaScript to expand and close the mobile menu and pull-down items, and automatically close the menu after clicking the link to ensure a good user experience. Finally, a navigation bar with clear structure, beautiful style, and support multi-device interaction is obtained, ending with a complete sentence.
    CSS Tutorial . Web Front-end 558 2025-08-06 06:11:00
  • In-Place vs. Copy: Memory and Performance Implications of PHP Sorts
    In-Place vs. Copy: Memory and Performance Implications of PHP Sorts
    PHP sorting functions are not really sorted in-place. 1. Although sort() and other functions will modify the original array, temporary memory still needs to be partitioned or merged internally; 2. Explicitly copying the array and then sorting (such as $sorted=$original;sort($sorted);) will double the memory usage; 3. Unnecessary array copying should be avoided, and built-in functions should be used first and unset() should be set in time when the original array is no longer needed; 4. For super-large data sets, chunking processing or streaming reading should be considered to reduce memory pressure; therefore, in memory sensitive scenarios, the original array should be directly sorted and redundant copies should be avoided, thereby minimizing memory overhead.
    PHP Tutorial . Backend Development 332 2025-08-06 06:10:01
  • MySQL Database Cloning for Development and Testing
    MySQL Database Cloning for Development and Testing
    The methods of directly copying production databases to the development and testing environment include: 1. Export and import using mysqldump, suitable for small and medium-sized databases, simple operation but slow speed; 2. Use physical file copying tools such as PerconaXtraBackup, suitable for large data volumes and does not affect online services; 3. Use MySQL8.0's CLONEPLUGIN to achieve remote cloning, suitable for automated deployment; at the same time, attention must be paid to data desensitization and access rights control to ensure security.
    Mysql Tutorial . Database 894 2025-08-06 06:03:01
  • How to embed a PDF in an HTML document
    How to embed a PDF in an HTML document
    There are three main ways to embed PDF using HTML: 1. Use tags, suitable for simple and fast integration, with the syntax as
    HTML Tutorial . Web Front-end 203 2025-08-06 05:53:02
  • How to create a multi-select dropdown list in HTML
    How to create a multi-select dropdown list in HTML
    To create an HTML multi-select drop-down list, you need to use an element with a multiple attribute. 1. Add a multiple attribute to allow multiple selection. Users can select discontinuous items through Ctrl (Command on Mac) or select a continuous range. 2. Use the size attribute to set the number of visible options, such as size="5" to display 5 options at the same time to improve usability; 3. Optionally customize styles through CSS, such as width, height, borders and fonts, but due to the browser's default style, deep customization requires the help of JavaScript library; 4. When submitting a form, if the backend needs an array format, it is recommended to set the name to "fruits[]
    HTML Tutorial . Web Front-end 895 2025-08-06 05:31:02
  • How to create a responsive team section with CSS?
    How to create a responsive team section with CSS?
    Use semantic HTML structure to define team member containers and content; 2. Use CSSFlexbox to implement responsive layout, and ensure cross-device adaptation through flex-wrap and gap; 3. Add media queries to optimize mobile display, such as setting full width of member items under the small screen; 4. Optional enhancements include social icons, CSS variables and lazy loading of images; ultimately, you can create a beautiful and responsive team display area without JavaScript.
    CSS Tutorial . Web Front-end 196 2025-08-06 04:57:01
  • How to connect to a MySQL database using PHP?
    How to connect to a MySQL database using PHP?
    Use MySQLi (procedural style) to connect to the database through the mysqli_connect() function and close the connection with mysqli_close(); 2. Use MySQLi (object-oriented style) to create connections through newmysqli(), and the code is clearer; 3. It is recommended to use PDO, because it supports multiple databases, and secure connections can be achieved through newPDO() and set exception mode; preprocessing statements should always be used to prevent SQL injection, store database credentials in configuration files outside the root directory of the web, and avoid displaying original error messages in the production environment. Finally, select MySQLi or PDO, but the abandoned mysql_* function cannot be used.
    Mysql Tutorial . Database 375 2025-08-06 04:56:01
  • Dynamic Array Generation from Strings Using explode() and preg_split()
    Dynamic Array Generation from Strings Using explode() and preg_split()
    explode()isbestforsplittingstringswithfixeddelimiterslikecommasordashes,offeringfastandsimpleperformance,whilepreg_split()providesgreaterflexibilityusingregularexpressionsforcomplex,variable,orpattern-baseddelimiters.1.Useexplode()forconsistent,known
    PHP Tutorial . Backend Development 399 2025-08-06 04:24:01
  • How to set the viewport for responsive design in an HTML document
    How to set the viewport for responsive design in an HTML document
    Tomakeawebpagedisplayproperlyonalldevices,includetheviewportmetatagintheHTMLhead;1.Addtosetthepagewidthtothedevicescreenwidthandinitialzoomto1;2.ThisensuresresponsiveCSSworkscorrectlybypreventingmobilebrowsersfromrenderingthepageatadesktopwidth;3.For
    HTML Tutorial . Web Front-end 414 2025-08-06 04:09:02

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