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- Memory-Efficient Iteration with PHP Generators and the `yield` Keyword
- Use the PHP generator and yield keywords to effectively process large data sets to avoid memory overflow; 1. The generator realizes lazy evaluation by yield value, leaving only one value in memory at a time; 2. It is suitable for scenarios such as reading large files line by line, such as using fgets combined with yield line by line, and processing logs or CSV files line by line; 3. Support key-value pair output, and explicitly specify key names; 4. It has the advantages of low memory footprint, concise code, and seamless integration with foreach; 5. However, there are restrictions such as inability to rewind, do not support random access, and cannot be reused, and it needs to be recreated before iteration is performed; therefore, when it is necessary to traverse a large amount of data, the use of generators should be given priority.
- PHP Tutorial . Backend Development 246 2025-08-03 01:38:01
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- How to create a responsive footer with CSS?
- Use semantic HTML structure, 2. Use Flexbox to implement responsive layout, 3. Optimize mobile display through media query, 4. Optionally add sticky bottom style; this method ensures that the footer remains beautiful and complete on all devices through flex-wrap and media query.
- CSS Tutorial . Web Front-end 583 2025-08-03 01:36:00
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- What is the rel='nofollow' attribute and when to use it in HTML
- Userel="nofollow"(orrel="sponsored"/rel="ugc")whenlinkingtountrusted,paid,oruser-generatedcontenttoavoidpassingSEOvalue;1.Applyrel="nofollow"touser-generatedlinksincommentsorforumstopreventspam;2.Userel="s
- HTML Tutorial . Web Front-end 863 2025-08-03 01:24:02
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- What is the role of a MySQL Database Administrator (DBA)?
- AMySQLDBAensuresdatabasesareefficient,secure,andreliablebyperformingsevenkeytasks:1.InstallingandconfiguringMySQLonserversorcloudplatforms,settingmemory,storageengines,andreplication;2.Monitoringandtuningperformanceusingqueryoptimization,indexing,and
- Mysql Tutorial . Database 639 2025-08-03 01:18:01
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- How to Write a Stored Procedure in MySQL?
- Writing a stored procedure in MySQL involves using DELIMITER to define syntax to avoid semicolon conflicts; 2. Use the CREATEPROCEDURE statement to create a process with parameters, such as IN, OUT or INOUT types; 3. Write SQL logic between BEGIN and END, which can include queries, variables, process control, etc.; 4. Call stored procedures through CALL statements and pass in corresponding parameters; 5. You can view existing processes through SHOWPROCEDURES and delete unnecessary processes with DROPPROCEDURE; 6. Best practices such as clear naming, concise logic, parameter verification and sufficient testing should be followed to ensure maintainability and performance, and ultimately realize code reuse and efficient execution.
- Mysql Tutorial . Database 595 2025-08-03 01:13:01
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- How to style a scrollbar with CSS?
- Yes, you can use WebKit pseudo-elements and Firefox-specific properties to beautify scrollbars through CSS. 1. Use pseudo-elements such as ::-webkit-scrollbar, ::-webkit-scrollbar-track, ::-webkit-scrollbar-thumb to customize scrollbar styles in Chrome, Edge, Safari; 2. Use scrollbar-width and scrollbar-color attributes in Firefox to set the scrollbar width and color; 3. Combine the two to achieve cross-browser compatibility; 4. It is recommended to retain accessibility, add hover effects, avoid too narrow sliders, and if necessary
- CSS Tutorial . Web Front-end 920 2025-08-03 01:08:01
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- What are MySQL's built-in string functions and how to use them?
- MySQLprovidesacomprehensivesetofstringfunctionsforefficienttextmanipulation,1.CONCAT()andCONCAT_WS()combinestringswithorwithoutaseparator,2.CHAR_LENGTH()andLENGTH()returncharacterandbytecountsrespectively,whileUPPER(),LOWER()changecase,3.SUBSTRING(),
- Mysql Tutorial . Database 945 2025-08-03 01:07:01
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- Inside the Zend Engine: How PHP's Switch Statement Actually Works
- TheswitchstatementinPHPisnotinherentlyfasterthanif-elseif;1)theZendEnginetypicallycompilesswitchintolinearlycheckedopcodes,resultinginO(n)performanceformostcases;2)onlysequentialintegercaseswithnogapsmaytriggerO(1)jumptableoptimization,butthisisrarea
- PHP Tutorial . Backend Development 849 2025-08-03 00:55:01
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- What is the DOM in relation to an HTML file
- TheDOMisalive,tree-likerepresentationofanHTMLdocumentcreatedbythebrowser,enablingdynamicinteractionthroughJavaScript.1.TheHTMLfileservesasthestaticblueprint.2.Uponloading,thebrowserparsestheHTMLandconstructstheDOM.3.EachelementbecomesanodeintheDOMtre
- HTML Tutorial . Web Front-end 107 2025-08-03 00:28:02
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- How to resolve 'Got a packet bigger than 'max_allowed_packet' bytes' error in MySQL?
- To resolve the error "Gotapacketbiggerthan'max_allowed_packet'bytes" in MySQL, you need to increase the max_allowed_packet configuration value; 1. Edit my.cnf or my.ini file, and add max_allowed_packet=256M in the [mysqld] section; 2. Restart MySQL service after saving; 3. You can temporarily set the global runtime value through SETGLOBALmax_allowed_packet=134217728; 4. Use mysql--max_allowed_packet=25 when importing large SQL files;
- Mysql Tutorial . Database 692 2025-08-03 00:13:01
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- Conditional Comments in HTML for IE
- ConditionalComments is a special comment syntax designed for Internet Explorer in HTML, allowing developers to load specific resources for different versions of IE. 1. It only takes effect in the specified IE version, such as
- HTML Tutorial . Web Front-end 846 2025-08-02 16:50:02
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- How to create an ordered list that continues numbering from a previous list in HTML
- To make the HTML ordered list follow the number of the previous list, the start attribute is required; 1. Set the start attribute in the subsequent tag, and the value is plus 1 to the last item of the previous list. For example, the previous list ends at 3, the new list uses start="4"; 2. Note that start only controls the display number and needs to manually calculate the starting value; 3. For dynamic or complex layouts, it is recommended to use CSS counters to achieve automatic continuous numbering to improve maintainability and accessibility; 4. Ensure that the list belongs to the same sequence semantically and performs screen reader testing when there are accessibility requirements. This method is simple and effective and is suitable for static content.
- HTML Tutorial . Web Front-end 954 2025-08-02 16:48:03
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- How to create a submit button that sends form data in HTML
- Use elements and set the action and method attributes to specify the data submission address and method; 2. Add input fields with name attribute to ensure that the data can be recognized by the server; 3. Use or create a submission button, and after clicking, the browser will send the form data to the specified URL, which will be processed by the backend to complete the data submission.
- HTML Tutorial . Web Front-end 542 2025-08-02 16:46:01
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- Using HTML `textarea` `rows` and `cols`
- The rows and cols properties of textarea control the number of lines in the text area and the number of characters per line respectively. rows specifies the number of lines displayed, and cols specifies the width of characters displayed per line. Both are based on character units, non-pixels or percentages. If the CSS width and height are set at the same time during use, CSS will override the rows and cols effects, especially when the mobile terminal may show differences due to screen size and zooming. It is recommended to use CSS to set width and height or use em units when the display requirements are high, and test the performance under different devices.
- HTML Tutorial . Web Front-end 179 2025-08-02 16:45:02
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