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- What is the HTML iframe tag and how to use it
- TheHTMLtagembedsexternalcontentintoawebpage;1.UsethesrcattributetospecifytheURLofthecontenttoembed;2.SetwidthandheightattributesoruseCSSforsizing;3.Alwaysincludeatitleforaccessibility;4.Applythesandboxattributetoenhancesecuritywhenembeddinguntrustedc
- HTML Tutorial . Web Front-end 527 2025-08-02 15:23:01
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- What is the novalidate attribute for an HTML form
- The novalidate attribute is used to disable the browser's default form verification; 1. After adding novalidate, the browser will not perform the default verification even if the input field contains constraints such as required, pattern, min, max, etc.; 2. The form will ignore whether the input is valid and submitted directly, which is suitable for custom verification using JavaScript, multi-step forms or temporary bypass verification in the development testing stage; 3. It is a Boolean property that does not require assignment, and acts on the entire form; 4. Remove novalidate to restore the normal verification behavior of the browser; therefore, novalidate enables developers to independently control the timing and method of form verification.
- HTML Tutorial . Web Front-end 499 2025-08-02 15:12:02
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- Deconstructing the Dangers: Why Modern PHP Developers Avoid $_REQUEST
- $_REQUESTisdiscouragedinmodernPHPbecauseitmergesinputfrom$_GET,$_POST,and$_COOKIE,creatingsourceambiguitythatunderminessecurityandpredictability.2.Thisambiguityenablesattackssuchascookietampering,requestmethodconfusion,andCSRFbypass,asseenwhenamalici
- PHP Tutorial . Backend Development 164 2025-08-02 15:10:01
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- Dynamic Key-Value Pair Injection in PHP Associative Arrays
- Usevariablekeysfordynamicassignmentbysetting$array[$key]=$valuewithruntimevariables,ensuringkeysfromuntrustedsourcesaresanitized.2.Mergemultiplekey-valuepairsatonceusingarray_merge($base,[$key=>$value]),notingitoverwritesexistingkeysandreindexesnu
- PHP Tutorial . Backend Development 585 2025-08-02 15:06:01
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- What are the best practices for writing clean and readable HTML code
- Use semantic HTML elements to improve accessibility, SEO, and code clarity, such as alternatives
- HTML Tutorial . Web Front-end 1020 2025-08-02 14:49:02
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- PHP 8's `match` Expression: A Superior Alternative to `if-elseif` Chains
- match expressions provide a more concise and safe alternative in PHP8. Compared with if-elseif and switch, it automatically performs strict comparisons (===) to avoid the error of loose type comparisons; 2. match is an expression that can directly return values, suitable for assignments and function returns, improving code simplicity; 3. match always uses strict type checking to prevent unexpected matches between integers, booleans and strings; 4. Supports single-arm multi-value matching (such as 0, false,''), but complex conditions (such as range judgment) still require if-elseif; therefore, match should be used first when mapping the exact value of a single variable, while complex logic retains if-elseif.
- PHP Tutorial . Backend Development 998 2025-08-02 14:47:01
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- A Comparative Analysis: Asynchronous PHP vs. Node.js for I/O-Bound Tasks
- Node.jsisbettersuitedforI/O-boundtasksthanasynchronousPHP.1.Node.jsusesanativeeventloopforefficientconcurrency,whileasyncPHPreliesonexternaltoolslikeSwooleorReactPHP.2.Node.jsachieveshigherthroughputandlowermemoryusageinI/Oscenarios,thoughSwoole-powe
- PHP Tutorial . Backend Development 537 2025-08-02 14:42:01
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- How to create a responsive blog layout with CSS?
- To create a responsive blog layout, the following steps must be followed: 1. Adopt a mobile-first design method, first write basic styles for the small screen, and then adapt to the large screen through media query; 2. Use CSSGrid or Flexbox to build a flexible page structure, such as using Grid to implement responsive grid layout of the main content and sidebar; 3. Add breakpoints to optimize the display effect of different devices, use two column layouts above 768px, and further improve the layout and font size above 1024px; 4. Use clamp() function to implement responsive fonts to ensure that the text has good readability on various devices; 5. Set max-width:100% to zoom the picture with the container to avoid overflow. Finally, through reasonable HTML structure and
- CSS Tutorial . Web Front-end 525 2025-08-02 14:20:01
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- What is query rewriting in MySQL and how can it help?
- QueryrewritinginMySQLimprovesperformance,readability,orcompatibilitybytransformingSQLqueriesintoequivalent,moreefficientformswithoutalteringresults.1.Itenhancesperformancebyenablingbetterindexusage,suchasrewritingWHEREYEAR(order_date)=2023asWHEREorde
- Mysql Tutorial . Database 805 2025-08-02 14:19:01
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- Creating PHP Arrays Programmatically for Dynamic Configurations
- DynamicarraysareessentialforflexiblePHPapplications,enablingruntimeadaptationsbasedonenvironment,userinput,orexternalsources.2.Useconditionallogictoincludeconfigurationsectionsonlywhenspecificconditionsaremet,suchasenablinglogginginnon-productionenvi
- PHP Tutorial . Backend Development 147 2025-08-02 14:18:01
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- How to create a typewriter effect with CSS?
- The core of creating typewriter effects using CSS is to control the width of the element through animation and hide overflow, combine overflow:hidden and border-right as the cursor, white-space:nowrap to maintain single lines, and animation to achieve typing and cursor flashing effects; 2. Key custom points include adjusting animation-duration to match text length, using the steps() function to set the number of steps (usually equal to the number of characters), selecting monospace font enhancement effects, and customizing the cursor style; 3. In responsive design, it is recommended to set width:fit-content and max-width:100% to suit different screens.
- CSS Tutorial . Web Front-end 680 2025-08-02 14:07:00
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- Set Theory in Practice: Leveraging `array_intersect` and `array_diff`
- Array comparison is commonly used for array_intersect() and array_diff() functions. 1.array_intersect() returns the common values of the two arrays, such as finding the common role of the user; 2.array_diff() returns the values in the first array that are not in other arrays, used to detect missing or redundant items; 3. Both are based on loose comparisons and retain the original keys, pay attention to the processing of parameter order and keys; 4. Actual applications include data synchronization, permission verification and input filtering; 5. For strict type or key-value comparison, array_intersect_assoc() or array_diff_assoc() should be used; these functions improve code readability and efficiency,
- PHP Tutorial . Backend Development 593 2025-08-02 14:06:02
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- Solving Complex Problems with Recursive Functions in PHP
- Recursive functions are an effective way to solve complex problems in PHP, especially suitable for handling nested data, mathematical calculations, and file system traversals with self-similar structures. 1. For nested arrays or menu structures, recursion can automatically adapt to any depth, terminate through the basis example (empty child) and expand layer by layer; 2. When calculating factorials and Fibonacci sequences, recursion intuitively implements mathematical definition, but naive Fibonacci has performance problems and can be optimized through memory; 3. When traversing the directory, recursion can penetrate into any level subdirectories, which is simpler than iteration, but attention should be paid to the risk of stack overflow; 4. When using recursion, it is necessary to ensure that the base case is reachable, avoid infinite calls, and when the depth is large, it should be considered to use iteration or explicit stack substitution to improve performance and stability. So when the problem contains "smaller itself
- PHP Tutorial . Backend Development 149 2025-08-02 14:05:02
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- How to create a card with a hover effect using CSS?
- To create a card with a hover effect, you must first build a basic HTML structure, including picture, title and description; 2. Use CSS to set the card style, including size, border, shadow and transition effects; 3. Use the:hover pseudo-class to realize the transformation during hover, such as shifting 5 pixels upwards and deepening shadows; 4. Optional enhancement effects include background color changes, picture zooming and fading into overlays; 5. Make sure to add transitions to the transform attributes to achieve smooth animations, and set the card to position:relative to support overlays. After complete implementation, the card will show a smooth visual feedback effect when hovering.
- CSS Tutorial . Web Front-end 427 2025-08-02 14:04:01
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