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- Submit a comment using PHP cURL: Easy Tutorial
- This article aims to guide beginners to submit comments to websites that support comment functionality using PHP's cURL library. We will use a simple example to demonstrate how to set cURL options, send POST requests, and process server responses. It should be noted that the target website must support submission of comments through POST requests.
- PHP Tutorial . Backend Development 887 2025-08-05 17:36:01
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- Dynamic Key Access in PHP: Techniques and Best Practices
- Use variables to dynamically access array keys and object properties, such as $data[$key] or $user->$property; 2. Always verify whether the keys or properties exist through isset(), array_key_exists() or property_exists() to avoid errors; 3. Use empty merge operators?? to provide default values to simplify the code; 4. Use curly braces {} to implement dynamic properties or method calls, such as $user->{$method}() for complex expressions; 5. Strictly verify the dynamic input source, and it is recommended to prevent illegal access through the whitelisting mechanism; 6. Avoid using mutable variables (such as $$var) to improve code readability and security; 7
- PHP Tutorial . Backend Development 996 2025-08-05 17:22:01
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- How to unpivot data in MySQL (columns to rows)?
- MySQL does not have a built-in UNPIVOT operator, but column conversion can be achieved by combining SELECT and UNIONALL. 1. Write a separate SELECT statement for each column, convert the column value into rows, and add an identification column (such as quarter); 2. Use UNIONALL to merge all results to ensure that the output structure of each query is consistent; 3. If there are multiple groups of indicators (such as sales, cost), you can expand the SELECT statement and add the indicator type column; 4. Finally sort it as needed. Although this method does not support dynamic columns and is verbose, it has strong compatibility, is suitable for all MySQL versions, and has reliable performance.
- Mysql Tutorial . Database 982 2025-08-05 17:13:01
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- How to use prefers-reduced-motion?
- Use prefers-reduced-motion to detect whether the user has enabled animation reduction in the system settings, thereby improving accessibility; 1. Wrap the animation or transition style in the @media(prefers-reduced-motion:reduce) query; 2. Disable or simplify animations within the media query, such as setting animation:none or transition:none; 3. Provide auto fallbacks for attributes such as scroll-behavior; 4. Test whether this function takes effect on macOS, Windows, iOS and Android devices; 5. Always respect the user's animation preferences and will
- CSS Tutorial . Web Front-end 551 2025-08-05 17:11:00
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- Prepending Elements Efficiently: A Look at `array_unshift` and its Performance
- array_unshift is an O(n) operation. Frequent use will cause O(n2) performance problems. 1. You should use a strategy that appends first and then inverts instead. 2. Or use data structures such as SplDoublyLinkedList that support O(1) header insertion. 3. Avoid repeated calls to array_unshift in loops, especially when processing large data sets, which can significantly improve performance.
- PHP Tutorial . Backend Development 409 2025-08-05 16:57:01
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- Tutorial for uploading Android WebView files to MySQL database
- This document is intended to provide a complete tutorial on how to upload images to a MySQL database through Android WebView. The tutorial covers front-end HTML code, back-end PHP code and related precautions to help developers understand the entire upload process and successfully implement the image upload function.
- PHP Tutorial . Backend Development 811 2025-08-05 16:57:01
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- How to create a split-screen layout with CSS?
- Using Flexbox, you can achieve equal-wide split-screen layout by setting container display:flex and child element flex:1; 2. Using CSSGrid can define two columns through grid-template-columns:1fr1fr to achieve the same effect; both of them fill the viewport with height:100vh, and a mobile stacked responsive layout can be achieved through media query, ultimately achieving a simple and flexible split-screen design.
- CSS Tutorial . Web Front-end 297 2025-08-05 16:48:01
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- How to build a timeline with CSS?
- The steps to build a timeline using pure CSS are: 1. Create a basic layout with an HTML structure containing time points, dates and content; 2. Draw the center vertical line through CSS and position each time item, align the content with Flexbox, and alternate left and right layout; 3. In responsive design, change the layout on the small screen to vertical stacking through media queries, and adjust the element position and style to adapt to mobile devices, ultimately implementing a cross-device-compatible, customizable modern timeline.
- CSS Tutorial . Web Front-end 461 2025-08-05 16:47:01
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- Mastering In-Place Array Updates with PHP References
- Use PHP references to achieve in-situ updates of arrays, avoiding copy overhead and improving performance. 1. Use the & operator to create references so that the variable points to the same data, and the modification is reflected to the original array; 2. When processing nested arrays, obtain deep element references through &, and directly modify them without reassigning; 3. Use &$item in the foreach loop to modify the original array elements, but unset($item) must be unset($item) after the loop to prevent subsequent side effects; 4. You can write functions to return deep references through dynamic paths, which are suitable for configuration management and other scenarios; 5. Although references are efficient, they should be used with caution to avoid overcomplex code, ensure that the logic is clear and comments are added if necessary. Correct use of references can significantly optimize large sizes
- PHP Tutorial . Backend Development 155 2025-08-05 16:46:01
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- Optimizing PHP Scripts: A Performance Analysis of Core Array Functions
- array_push and array_pop are O(1) operations, and $arr[]=$value should be used instead of array_push; 2.array_shift and array_unshift are O(n) operations, and it is necessary to avoid using it in large array loops; 3.in_array is O(n) and array_key_exists is O(1), and data should be reconstructed and used to search for substitute values; 4.array_merge is O(n) and reindexed, and operators can be replaced if necessary; 5. Optimization strategies include: using isset to search, avoid modifying large arrays in loops, using generators to reduce memory, batch merge arrays, and cache duplicate searches
- PHP Tutorial . Backend Development 659 2025-08-05 16:44:01
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- Solve the problem that PHPMailer cannot resolve imports in Eclipse
- This article aims to help developers solve the problem of encountering "the import ... cannot be resolved" error in the Eclipse IDE when using PHPMailer. By analyzing namespace, case sensitivity, and Composer package management mechanism, we provide clear solutions to ensure that PHPMailer can be imported and used correctly.
- PHP Tutorial . Backend Development 304 2025-08-05 16:39:00
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- MySQL operation using PHP: Performance comparison of mysqli library vs. exec command
- This article aims to compare the performance differences in the execution of MySQL queries using PHP's mysqli library and exec commands. By analyzing the execution process of the two methods, the advantages of the mysqli library in connection multiplexing, resource consumption, etc. are revealed, and the importance of directly using the database extension library for database operations.
- PHP Tutorial . Backend Development 456 2025-08-05 16:30:02
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- Optimizing MySQL for High-Volume Transaction Processing
- Tohandlehigh-volumetransactionsinMySQL,useInnoDBasthestorageengine,tuneitssettingslikebufferpoolsizeandlogfilesize,optimizequerieswithproperindexing,andmanageconnectionsefficiently.First,switchtoInnoDBforrow-levellockingandACIDcomplianceusingALTERTAB
- Mysql Tutorial . Database 929 2025-08-05 16:30:01
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- Recursive Search Strategies for Deeply Nested PHP Arrays
- To effectively search for deep nested PHP arrays, you need to use recursive methods. 1. Check whether the value exists: by traversing each element and recursively checking the child array, return true immediately once the target value is found; 2. Check whether the key exists: traverse the key name layer by layer, and return true if the current key matches or the key is found in the child array; 3. Find the complete path of the key: record the path during the recursive process, and return the complete sequence of key names from the root to the key when the key is found; 4. Return the parent array containing the target key: after positioning the key, return its direct parent array for context operations; 5. Performance optimization suggestions: Avoid deep copy, use strict comparison, and terminate the search as soon as possible. For frequent queries, the array can be flattened into a point-delimited key name structure to achieve fast search, recursion is suitable for complex
- PHP Tutorial . Backend Development 913 2025-08-05 16:24:02
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