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- Mitigating Common Vulnerabilities by Sanitizing Superglobal Inputs
- Alwaysvalidateandsanitizesuperglobalinputsusingfunctionslikefilter_input()orfilter_var()toensuredatameetsexpectedcriteriaandisfreeofmaliciouscontent.2.UsepreparedstatementswithparameterizedquerieswhenhandlingdatabaseoperationstopreventSQLinjection,ev
- PHP Tutorial . Backend Development 556 2025-08-03 10:33:01
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- How to use the HTML br tag for line breaks
- TheHTMLtagisusedtoinsertalinebreakwithoutstartinganewparagraph.2.Itisidealforpoetry,addresses,andshortmulti-linetextwherelinestructurematters.3.Thetagisself-closingandwrittenasinHTML5orinXHTML.4.Avoidoverusingitforspacing;instead,useCSSmarginorpaddin
- HTML Tutorial . Web Front-end 158 2025-08-03 10:19:01
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- css columns property example
- The columns attribute of CSS can be used to create multi-column layouts. The answer is to be implemented by setting column-width and column-count; 1. Use columns:3150px to represent up to 3 columns and each column has a width of at least 150px; 2.column-gap sets the column spacing, such as 20px; 3.column-rule adds intercolumn separators, such as 1pxsolid#ccc; 4. The number of columns or column widths can be set separately; 5. The content must be block-level elements, which are well supported by modern browsers, but are not suitable for flex or grid direct child elements. This attribute is suitable for responsive text layout, and the final effect is automatically adjusted and fully presented by the browser.
- CSS Tutorial . Web Front-end 792 2025-08-03 10:08:01
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- A Guide to Graceful Termination of Infinite Loops Using `break`
- Usethebreakstatementtoexitinfiniteloopswhenaconditionismet,suchasuserinputortaskcompletion.2.Pairbreakwithclear,meaningfulconditionstoensureloopsremainreadableandresponsive.3.Avoidoverusingbreakbyemployingflagvariablesforcomplexlogictomaintaincodecla
- PHP Tutorial . Backend Development 359 2025-08-03 10:02:00
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- The Evolution of Callbacks: First-Class Callable Syntax in PHP 8.1
- PHP8.1didnotintroducefirst-classcallablesyntax;thisfeatureiscominginPHP8.4.1.PriortoPHP8.4,callbacksusedstrings,arrays,orClosures,whichwereerror-proneandlackedIDEsupport.2.PHP8.1improvedtheecosystemwithenums,fibers,andbettertypingbutdidnotchangecalla
- PHP Tutorial . Backend Development 1018 2025-08-03 10:00:03
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- How to use the CSS ch and ex units?
- The unit of ch is equal to the width of the "0" character in the current font, which is suitable for layout based on the number of characters, such as setting the width of the input box to 10ch to accommodate about 10 characters; 2.ex unit is equal to the height of the lower case "x" in the current font, and is often used for icon size or up-and-down positioning, such as setting the height width of the icon to 1.2ex to match the visual height of the text; 3. Both rely on actual font rendering and adjust according to changes in font-family, which is suitable for improving readability and layout accuracy, but attention should be paid to the difference in character width in proportional fonts and compatibility issues of old browsers. Finally, it is recommended to use it reasonably in text-intensive designs to enhance responsiveness and consistency.
- CSS Tutorial . Web Front-end 596 2025-08-03 09:42:02
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- Crafting a Robust Log File Parser with PHP's `preg_match_all`
- Use the preg_match_all function to cooperate with regular expressions to efficiently parse PHP log files. 1. First analyze the log format such as Apache's CLF; 2. build a regular pattern with named capture groups to extract IP, methods, paths and other fields; 3. Use preg_match_all to cooperate with the PREG_SET_ORDER flag to parse multi-line logs in batches; 4. Handle edge cases such as missing fields or cross-row logs; 5. Verify and type convert the extracted data, and finally convert the unstructured logs into structured array data for further processing.
- PHP Tutorial . Backend Development 417 2025-08-03 09:20:01
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- Analyzing the Performance Overhead of the $GLOBALS Superglobal
- Theperformanceoverheadof$GLOBALSisminimalinmostcasesbutcanbecomesignificantinhigh-frequencyfunctionsorlong-runningscripts;1.$GLOBALScreatessymboltableandmemoryoverheadbymirroringallglobalvariables;2.Arrayaccessvia$GLOBALS['var']isslowerthandirectvari
- PHP Tutorial . Backend Development 300 2025-08-03 09:16:01
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- Managing MySQL Connection Limits and Timeouts
- To solve the connection limit and timeout problems of MySQL, first, check and adjust the maximum number of connections, view the current max_connections through SHOWVARIABLES and increase the value appropriately in my.cnf; second, set the wait_timeout and interactive_timeout parameters reasonably to extend the survival time of idle connections; third, optimize the connection behavior of the application side, use the connection pool, release the connection in time, and avoid zombie connections; finally, ensure that the system-level file descriptor limits meet MySQL connection requirements, modify limits.conf and confirm that they take effect.
- Mysql Tutorial . Database 367 2025-08-03 09:11:01
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- How to handle multi-row subqueries in MySQL?
- To handle multi-line subqueries in MySQL, operators that support set comparisons must be used, because =,>,
- Mysql Tutorial . Database 465 2025-08-03 09:09:02
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- How to create a CSS-only slideshow?
- Use hidden radio input and:checked pseudo-class to control slide switching; 2. Related input with slideshow and navigation points through ~ brother selector; 3. Use opacity and transition to achieve fading effect; 4. The navigation label is bound to the input through the for attribute and styled into indicator points; 5. The optional automatic playback requires complex CSS animation but poor maintenance, and it is recommended to rely on user interaction. This method does not require JavaScript, leverages CSS selectors and form states to achieve lightweight and accessible slideshow functionality, suitable for simple image display scenarios.
- CSS Tutorial . Web Front-end 523 2025-08-03 09:08:01
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- Mastering Complex Sort Logic with `usort` and Custom Callbacks
- Use usort() to solve the multi-condition sorting problem of complex data in PHP. 1. Define the sorting logic through a custom callback function and use the operator to return -1, 0 or 1; 2. When implementing multi-level sorting, first compare the main fields, and if equal, enter the secondary fields step by step; 3. Create dynamic callback functions to flexibly adjust the sorting fields and directions according to the configuration array; 4. Support complex types such as date and calculated values, but preprocessing and time-consuming operations are required to improve performance; 5. If the original key name is required, uasort() should be used instead of usort(); finally, efficient and maintainable intelligent sorting is achieved through structured callbacks, and the end is complete.
- PHP Tutorial . Backend Development 798 2025-08-03 09:07:01
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- How to upgrade a MySQL server to a newer version?
- CheckcompatibilitywithOS,applications,andfeatures;2.Backupalldata,configs,andlogs;3.Chooseupgrademethod(packagemanager,MySQLInstaller,ormanual);4.Runpost-upgradechecksandtests;5.Resolveissueslikeauthenticationpluginsordeprecatedoptions.Alwaysbackup,t
- Mysql Tutorial . Database 414 2025-08-03 09:04:01
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- What is the difference between a primary key and a unique key in MySQL?
- AprimarykeycannotcontainNULLvalues,whileauniquekeyallowsoneNULLpercolumn;2.Atablecanhaveonlyoneprimarykeybutmultipleuniquekeys;3.Bothcreateuniqueindexes,buttheprimarykeycreatesaclusteredindex(inInnoDB),whereasuniquekeyscreatenon-clusteredindexes;4.Pr
- Mysql Tutorial . Database 684 2025-08-03 09:03:01
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