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- 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
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- 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
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- 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
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- 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
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- 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
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- `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
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- 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
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- How to Prevent SQL Injection Attacks in MySQL?
- UsepreparedstatementswithparameterizedqueriestoseparateSQLlogicfromdata.2.Validateandsanitizeinputbycheckingtype,length,format,andusingallowlistsforallowedcharacters.3.Limitdatabaseuserprivilegesbygrantingonlynecessarypermissionsandavoidingadminaccou
- Mysql Tutorial . Database 130 2025-08-05 19:16:01
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- Making Custom Objects Iterable: Implementing Iterator and IteratorAggregate
- To make PHP custom objects available in foreach, you need to implement the Iterator or IteratorAggregate interface. 1. Use the Iterator interface to implement five methods: current(), key(), next(), return() and valid(). It is suitable for scenarios where fine control of the iteration process is required, as shown in the TaskList class example; 2. Use the IteratorAggregate interface to implement the getIterator() method and return a Traversable object (such as ArrayIterator), which is suitable for scenarios where existing data is simply wrapped, such as TaskCollec
- PHP Tutorial . Backend Development 677 2025-08-05 19:12:01
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- The Big O of Core PHP Array Operations: A Performance Analysis
- The time complexity of PHP array operations varies according to the operation type. The performance of key operations is as follows: 1. The array read, write and assignment are O(1). Because PHP uses a hash table to implement, the average key search is constant time; 2. unset($array['key']) is O(1), and only marks deletion is not immediately reindex; 3. Array_unshift() and array_shift() are O(n), because all elements need to be re-arranged; 4. Add or pop at the end of the array (such as [], array_push, array_pop) is O(1), suitable for stack or queue operations; 5. in_array() and array_search() are O(n), and need to be linearly passed.
- PHP Tutorial . Backend Development 252 2025-08-05 19:09:01
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- How to get client TLS version information in Nginx and PHP-FPM
- This article introduces how to obtain the TLS version information used by client connections by calling external APIs through client JavaScript in Nginx and PHP-FPM environments. This method uses the free API provided by howsmyssl.com, allowing developers to obtain TLS information on the client and send it to the server via GET or POST requests for use in PHP.
- PHP Tutorial . Backend Development 501 2025-08-05 19:09:00
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- What does z-index do in CSS?
- z-indexinCSScontrolsthestackingorderofpositionedelementsalongthez-axis.ElementsarestackedbasedonHTMLorderbydefault,butz-indexoverridesthiswhenelementsoverlap.Itonlyworksonpositionedelements(position:relative,absolute,fixed,orsticky)andacceptsintegerv
- CSS Tutorial . Web Front-end 803 2025-08-05 19:08:01
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- What is the difference between the HTML em and i tags
- Thetagisusedforemphasis,conveyingvocalstressthataltersmeaning,improvesaccessibilityviascreenreaderintonation,andcarriessemanticimportance.2.Thetagindicatesstylisticorsemanticdistinctionslikeforeignwordsorthoughts,withoutimplyingemphasis,offeringsubtl
- HTML Tutorial . Web Front-end 987 2025-08-05 19:01:21
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- Use Nginx and PHP to get client TLS version information
- This article describes how to obtain TLS version information from the client through JavaScript scripts and send it to the server through GET or POST requests so that the PHP application can obtain the TLS version of the client in an Nginx environment. This approach utilizes the third-party API howsmyssl.com without modifying the configuration of Nginx or PHP-FPM.
- PHP Tutorial . Backend Development 120 2025-08-05 19:00:01
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