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- HTML `srcdoc` Attribute for Iframes
- The srcdoc property is used in HTML tags, embedding HTML content directly instead of loading the page through external URLs. 1. It is often used to test HTML fragments, embed small independent documents, or avoid additional HTTP requests; 2. The difference from src is that src points to an external URL, while srcdoc directly contains HTML strings, and browsers preferentially use srcdoc; 3. When using it, you need to pay attention to content integrity, quotation mark escapes and complex pages. 4. It is compatible with mainstream browsers, but is not recommended for support scenarios of old browsers.
- HTML Tutorial . Web Front-end 697 2025-08-02 15:33:02
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- Unlocking Complex Logic for Updating Specific Array Elements
- To effectively update specific elements in an array, conditional logic, immutability principles and performance optimization strategies must be combined. 1. Use findIndex() to locate a single matching element and update it with the expansion operator, or use map() to update all elements that meet the conditions, and give priority to keeping the original array unchanged; 2. For nested structures, use map() and nested map() to judge the update layer by layer, or write recursive functions to process dynamic paths; 3. In frameworks such as React, use map() to return a new array through functional setState to ensure that the correct re-render is triggered; 4. For large arrays, data can be converted into object mapping to realize O(1) search and update, and if necessary, then return to the array to exchange space for time.
- PHP Tutorial . Backend Development 255 2025-08-02 15:32:01
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- PHP Array Internals: Understanding Copy-on-Write and Reference Semantics
- PHP arrays realize efficient memory management through the Copy-on-Write (copy on write) mechanism, that is, multiple variables share the same array until a write operation occurs; 1. Only increase the reference count of zval when assigning, and do not copy the data immediately; 2. Trigger copy when modifying the array and refcount > 1; 3. Reference assignment (&) makes the variables share zval, bypassing the COW mechanism; 4. Mixed references and ordinary variables may lead to implicit separation and performance overhead; 5. Function parameters are passed by value by default but protected by COW, and read-only does not copy; 6. Reference parameters can modify the original array; 7. Unset reduces refcount, but the array is not released when the reference exists; therefore, unnecessary references should be avoided
- PHP Tutorial . Backend Development 110 2025-08-02 15:31:00
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- A Deep Dive into `array_walk` for Complex Array Transformations
- array_walk is a powerful function in PHP for modifying array elements in place. It is suitable for scenarios where complex transformations are required based on key names, nested structures, or external states. 1. It passes arrays and elements through references and directly modifys the original array; 2. The callback function can access keys and values and supports the third parameter passing context; 3. It can process multi-dimensional arrays in combination with recursion; 4. It is suitable for batch modification of object properties; 5. It does not return a new array, and its performance is better than array_map but is not suitable for scenarios where the original array needs to be retained. When used correctly, it performs efficiently and has a clean code in handling context-sensitive or recursive data transformations.
- PHP Tutorial . Backend Development 883 2025-08-02 15:28:01
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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 526 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 498 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 162 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 582 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 1018 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 997 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 536 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 524 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 804 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 145 2025-08-02 14:18:01
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