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  • How to use thead, tbody, and tfoot to structure an HTML table
    How to use thead, tbody, and tfoot to structure an HTML table
    Use and can improve the readability, accessibility and maintainability of tables; 1. Tables should contain for table headers, for body data, for summary information, and should be ahead of the code to ensure correct rendering; 2. These elements help screen reader parsing, support CSS style control, implement table header duplication during printing, and simplify JavaScript operations; 3. Each table can only have one and one, but can contain multiple data to group data. The header should always be explicitly used to define tables and avoid omission, thereby enhancing semantics and professionalism.
    HTML Tutorial . Web Front-end 479 2025-08-05 19:56:02
  • The Complete Playbook for Adding, Prepending, and Inserting into PHP Arrays
    The Complete Playbook for Adding, Prepending, and Inserting into PHP Arrays
    To add elements to a PHP array, you need to select different methods according to the position: 1. Use $[] syntax or array_push() to add elements at the end. $[] is recommended because it is more concise and efficient; 2. Use array_unshift() to add elements at the beginning, but the numeric keys will be reset; 3. Use array_splice() to insert elements at the specified position in the middle, which is suitable for indexing arrays; 4. It is recommended to insert them with array_merge() combined with array_slice() to preserve the key names. Each method is suitable for different scenarios. It should be reasonably selected based on the array type and insertion position, and ultimately achieve flexible and efficient array operations.
    PHP Tutorial . Backend Development 462 2025-08-05 19:54:01
  • CodeIgniter 4 Setting Cookies Invalid Errors and Solutions
    CodeIgniter 4 Setting Cookies Invalid Errors and Solutions
    This article aims to solve the problem that the set_cookie() function cannot take effect in CodeIgniter 4. We will dig deeper into the cause of this problem and provide effective solutions to ensure that cookies are set and read correctly.
    PHP Tutorial . Backend Development 249 2025-08-05 19:54:00
  • CodeIgniter 4 Setting Cookies Invalid Problem Solving Guide
    CodeIgniter 4 Setting Cookies Invalid Problem Solving Guide
    This article aims to solve the problem that after using the set_cookie() function to set a cookie in CodeIgniter 4, the cookie cannot be obtained on the redirect page. By analyzing the cause of the problem and providing the right solution, helping developers set and use cookies smoothly in CodeIgniter 4 projects. The key is to understand the role of the withCookies() method and apply it to the redirection response.
    PHP Tutorial . Backend Development 174 2025-08-05 19:48:00
  • Creating HTML Frames with `frameset` (Legacy)
    Creating HTML Frames with `frameset` (Legacy)
    HTMLframesareoutdatedbutunderstandingthemisusefulforhistoricalcontextormaintainingolderwebsites.1.FramesuseinsteadoftodividepagesintosectionswithseparateHTMLfiles.2.Layoutscanbedefinedusingrowsorcolumnsviathecolsorrowsattribute.3.Eachsupportsattribut
    HTML Tutorial . Web Front-end 134 2025-08-05 19:41:22
  • Why Caching `count()` Outside Your PHP For Loop Matters
    Why Caching `count()` Outside Your PHP For Loop Matters
    When using count(), its results should be cached outside the loop to avoid the performance overhead caused by repeated calls; 1. Calling count() in each loop will increase unnecessary function overhead, and executing $count=count($array) in advance can make the function run only once; 2. For large arrays (such as 50,000 elements), uncache will result in 49,999 redundant calls, with a significant performance impact; 3. This optimization principle also applies to functions such as strlen() and sizeof() that do not change in the loop; 4. Although the count() of the array is O(1), the function call itself still has symbol lookup and stack frame overhead; therefore, pre-storing the count() result is a side effect without side effect
    PHP Tutorial . Backend Development 733 2025-08-05 19:36:01
  • Solutions where cookie settings in CodeIgniter 4 do not take effect
    Solutions where cookie settings in CodeIgniter 4 do not take effect
    This article aims to solve the problem that after setting cookies using the set_cookie() function in CodeIgniter 4, the cookies cannot be obtained after redirection. By using the withCookies() method, ensure that cookies are correctly set during redirection, and provide sample code and precautions to help developers complete cookie settings smoothly.
    PHP Tutorial . Backend Development 267 2025-08-05 19:36:01
  • How to merge table cells with colspan and rowspan in HTML
    How to merge table cells with colspan and rowspan in HTML
    The colspan and rowspan attributes are required to merge HTML table cells. 1. Use colspan to make cells span multiple columns. For example, set colspan="2" to make one cell occupy the width of two columns, and the number of other cells in the row needs to be reduced accordingly to keep the number of columns consistent; 2. Use rowspan to make cells span multiple rows, such as rowspan="2" to make cells span two rows, and the cell will no longer be added repeatedly in subsequent rows; 3. You can use colspan and rowspan at the same time to achieve complex layout, such as a cell spans two columns and two rows across two rows. At this time, you need to ensure that the total number of columns per row (including merged cells) matches other rows.
    HTML Tutorial . Web Front-end 215 2025-08-05 19:35:22
  • How to change the data type of a column in a MySQL table?
    How to change the data type of a column in a MySQL table?
    To change the data type of a column in a MySQL table, use the ALTERTABLE statement with the MODIFY or CHANGE clause. 1. Use MODIFY to modify only the data type and attributes but not rename the column. The syntax is ALTERTABLE table name MODIFY column name new data type [constraint], such as ALTERTABLEusersMODIFYageTINYINTNOTNULLDEFAULT0; 2. Use CHANGE to modify the column name and data type at the same time, and the syntax is ALTERTABLE table name CHANGE original column name new column name new data type [constraint], such as ALTERTABLEusersCHANGEageuser_
    Mysql Tutorial . Database 820 2025-08-05 19:26:01
  • Use Nginx to get the client TLS version and pass it to PHP
    Use Nginx to get the client TLS version and pass it to PHP
    This article describes how to obtain TLS version information through client JavaScript and pass it to PHP-FPM for processing. This method uses a third-party API to obtain the client TLS version and sends data to the server through GET or POST requests, thereby achieving TLS version information that Nginx cannot directly provide.
    PHP Tutorial . Backend Development 274 2025-08-05 19:24:00
  • How to create a Gooey effect with CSS and SVG filters?
    How to create a Gooey effect with CSS and SVG filters?
    Thegooeyeffectiscreatedbyapplyingablurandcompositefiltertoelements,makingthemappeartomergelikeblobs.2.AddtheSVGfilterwithfeGaussianBlur,feColorMatrix,andfeBlendtoyourHTMLtodefinethegooeyeffect.3.ApplythefilterinCSSusingfilter:url('#goo')onacontainerh
    CSS Tutorial . Web Front-end 885 2025-08-05 19:23:00
  • `continue` vs. `break`: A Strategic Guide to PHP Loop Flow Control
    `continue` vs. `break`: A Strategic Guide to PHP Loop Flow Control
    break is used to exit the loop immediately, and continue is used to skip the current iteration and continue to the next loop. 1. Use break when you need to stop the loop completely, for example, terminate the search after finding the target value; 2. Use continue when only specific elements need to be skipped, for example filtering invalid data; 3.break can exit the multi-layer nested loop with numerical parameters; 4.continue can also specify the level to skip the current iteration of the outer loop; 5. Avoid excessive use of break to cause logical confusion, and ensure that the continue conditions are clear to prevent unexpected execution. Correctly distinguishing the two can improve code performance and readability.
    PHP Tutorial . Backend Development 513 2025-08-05 19:18:01
  • How to use LOAD DATA INFILE for bulk data loading in MySQL?
    How to use LOAD DATA INFILE for bulk data loading in MySQL?
    LOADDATAINFILEisthefastestmethodforbulkimportingdataintoMySQL.1.Usethebasicsyntaxwithfilepath,field/linedelimiters,andoptionalcolumnlist.2.Forserver-sidefiles,ensurethefileisaccessibletotheMySQLserverandtheuserhasFILEprivilege.3.Forclient-sidefiles,u
    Mysql Tutorial . Database 148 2025-08-05 19:17:01
  • How to Prevent SQL Injection Attacks in MySQL?
    How to Prevent SQL Injection Attacks in MySQL?
    UsepreparedstatementswithparameterizedqueriestoseparateSQLlogicfromdata.2.Validateandsanitizeinputbycheckingtype,length,format,andusingallowlistsforallowedcharacters.3.Limitdatabaseuserprivilegesbygrantingonlynecessarypermissionsandavoidingadminaccou
    Mysql Tutorial . Database 132 2025-08-05 19:16:01

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