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  • How to use the CSS :target pseudo-class with HTML anchors?
    How to use the CSS :target pseudo-class with HTML anchors?
    TheCSS:targetpseudo-classallowsstylingofaspecificwebpagesectionwhenitistargetedviaaURLfragment.Whenauserclicksalinklike,thebrowserscrollstotheelementwiththematchingid,and:targetappliesstylesonlytothatactiveelement.Forexample,clicking"JumptoBox&q
    HTML Tutorial . Web Front-end 834 2025-07-09 00:12:52
  • How Do You Secure File Uploads in PHP?
    How Do You Secure File Uploads in PHP?
    TosecurelyhandlefileuploadsinPHP,youmusttreateveryfileasapotentialthreatandimplementmultipleprotectivemeasures.1.LimitfiletypesusingawhitelistandverifytheactualextensionafterrenaminginsteadofrelyingonMIMEtypes.2.Renamefileswithuniqueidentifierstoprev
    PHP Tutorial . Backend Development 413 2025-07-09 00:08:40
  • Configuring SEO and Social Sharing with HTML Meta Tags
    Configuring SEO and Social Sharing with HTML Meta Tags
    To optimize the website's SEO and social media sharing effect, the HTML meta tag should be set correctly. The specific steps are as follows: 1. Set up SEO-related meta tags, including tags containing keywords and no more than 60 characters, labels that attract clicks and control them to about 160 words, and add them to improve the mobile experience; 2. Configure commonly used meta tags on social media sharing, such as og:title, og:description, og:image, og:url and og:type in the OpenGraph protocol, as well as Twitter:card tags for TwitterCard to ensure that appropriate titles, descriptions and pictures are displayed when sharing; 3. Pay attention to debugging
    HTML Tutorial . Web Front-end 880 2025-07-09 00:07:22
  • Structuring Content Using Unordered and Ordered Lists in HTML
    Structuring Content Using Unordered and Ordered Lists in HTML
    Unordered lists are suitable for items without a specific order, and are wrapped with tags, and each entry is represented by; an ordered list is used for content with sequence requirements, and each entry is also represented by tags. 1. Unordered lists use dots as marking symbols by default, and are often used in scenarios such as website navigation menus, article labels or product feature introductions. 2. The ordered list is displayed in sequence through numbering, suitable for operation steps, competition rankings or teaching processes, and the numbering style can be defined through type attributes. 3. Lists can be used in nesting and can be included with each other, but you need to pay attention to issues such as indentation, hierarchy, and semantics to improve readability and SEO effect.
    HTML Tutorial . Web Front-end 915 2025-07-09 00:05:42
  • mysql data types explained
    mysql data types explained
    ChoosingtherightMySQLdatatypeimprovesstorage,performance,andquerybehavior.1.UseINTforgeneralwholenumbers,TINYINTforsmallranges,DECIMALforexactprecision(e.g.,financialdata),FLOAT/DOUBLEforapproximatescientificvalues,andavoidoverusingBIGINT.2.ChooseCHA
    Mysql Tutorial . Database 648 2025-07-09 00:04:50
  • how to loop through php array
    how to loop through php array
    Common methods of traversing arrays by PHP include: 1. Use foreach to handle associative and indexed arrays, suitable for scenarios where indexes are not manually controlled; 2. Use for loops to traverse indexed arrays, suitable for situations where indexes need to be precisely controlled, but attention should be paid to avoid repeated calls to count() and non-continuous indexes; 3. While combined with each() for old versions of PHP traversal, but it has been deprecated in PHP8; 4.array_map is used to execute functions on each element and return a new array; 5.array_walk is used to directly modify the original array or execute side effects. Choosing the appropriate method according to the specific scenario can improve development efficiency and code readability.
    PHP Tutorial . Backend Development 927 2025-07-09 00:02:01
  • Better CSS Shapes Using shape() — Part 4: Close and Move
    Better CSS Shapes Using shape() — Part 4: Close and Move
    The shape() function's close and move commands may not be ones you reach for often, but are incredibly useful for certain shapes.
    CSS Tutorial . Web Front-end 176 2025-07-08 09:51:11
  • Working with JSON data type in MySQL
    Working with JSON data type in MySQL
    MySQL supports JSON data types introduced since version 5.7 to handle structured and semi-structured data. 1. When inserting JSON data, you must use a legal format. You can use JSON_OBJECT or JSON_ARRAY functions to construct, or pass in the correct JSON string; 2. Updates should use JSON_SET, JSON_REPLACE, JSON_REMOVE to modify some fields instead of the entire replacement; 3. Query can extract fields through JSON_CONTAINS, -> operators, and note that the string value needs to be double quoted; 4. It is recommended to create a generated column and index to improve performance when using JSON type.
    Mysql Tutorial . Database 742 2025-07-08 02:57:21
  • Understanding the MySQL optimizer's behavior
    Understanding the MySQL optimizer's behavior
    The MySQL query optimizer selects the optimal execution plan based on statistical information. The core mechanism is a cost-based model (CBO), which estimates I/O and CPU costs to determine the execution path; 1. Perform ANALYZETABLE regularly to ensure the accuracy of statistical information; 2. Indexes are not always used, such as querying large amounts of data or function operations may fail; 3. It is recommended to use EXPLAIN to view the execution plan, create overlay indexes, and avoid implicit type conversion; 4. The optimizer can be booted through USEINDEX or FORCEINDEX, but be cautious; 5. Rewriting the SQL structure and controlling the connection order can also affect the optimization results. Mastering these logic and combining tool analysis can help to optimize efficiently.
    Mysql Tutorial . Database 909 2025-07-08 02:56:01
  • Using JSON Data Type and Functions in MySQL 5.7 and Later
    Using JSON Data Type and Functions in MySQL 5.7 and Later
    MySQL5.7 natively supports JSON data types, improving the efficiency of processing unstructured data. 1. Use the JSON type to automatically verify the data format and provide special function operation content; 2. When querying, field values ??can be extracted through -> or JSON_EXTRACT(), supporting array element extraction; 3. Use functions such as JSON_SET(), JSON_REPLACE(), JSON_REMOVE() to modify data; 4. You can optimize the query performance of JSON fields by generating virtual columns and establishing indexes; 5. Although it is flexible, JSON type should not be abused, and it needs to be used in combination with actual scenarios.
    Mysql Tutorial . Database 311 2025-07-08 02:53:40
  • Using triggers for database automation in MySQL
    Using triggers for database automation in MySQL
    A trigger is an automatically executed database object in MySQL that is used to perform predefined SQL operations when a specific event occurs. It can automatically update timestamps, verify or record data changes, maintain redundant fields, implement cascading operations, etc. To create a trigger, you need to specify the trigger timing (BEFORE/AFTER), event type (INSERT/UPDATE/DELETE) and execution logic, such as automatically populating the created_at field with BEFOREINSERT. When using it, you should pay attention to problems such as debugging difficulties, performance impact, high maintenance costs and inapplicability to distributed systems. It is recommended to keep the logic simple and make comments. Common scenarios include recording modification logs, restricting illegal operations, synchronous update of statistics tables and automatic filling
    Mysql Tutorial . Database 410 2025-07-08 02:53:20
  • Grouping Data with GROUP BY and Aggregate Functions in MySQL
    Grouping Data with GROUP BY and Aggregate Functions in MySQL
    To extract summary information from the database, use GROUPBY and aggregate functions. GROUPBY can group data by field, and is often used in combination with aggregate functions such as SUM, COUNT, AVG, MAX, MIN, etc.; non-aggregated fields must appear in GROUPBY after SELECT; multi-field grouping is combined in order; HAVING is used to filter grouping results, such as filtering users with a total order amount of more than 1,000.
    Mysql Tutorial . Database 395 2025-07-08 02:52:01
  • Handling character sets and collations issues in MySQL
    Handling character sets and collations issues in MySQL
    Character set and sorting rules issues are common when cross-platform migration or multi-person development, resulting in garbled code or inconsistent query. There are three core solutions: First, check and unify the character set of database, table, and fields to utf8mb4, view through SHOWCREATEDATABASE/TABLE, and modify it with ALTER statement; second, specify the utf8mb4 character set when the client connects, and set it in connection parameters or execute SETNAMES; third, select the sorting rules reasonably, and recommend using utf8mb4_unicode_ci to ensure the accuracy of comparison and sorting, and specify or modify it through ALTER when building the library and table.
    Mysql Tutorial . Database 497 2025-07-08 02:51:00
  • Implementing Transactions and Understanding ACID Properties in MySQL
    Implementing Transactions and Understanding ACID Properties in MySQL
    MySQL supports transaction processing, and uses the InnoDB storage engine to ensure data consistency and integrity. 1. Transactions are a set of SQL operations, either all succeed or all fail to roll back; 2. ACID attributes include atomicity, consistency, isolation and persistence; 3. The statements that manually control transactions are STARTTRANSACTION, COMMIT and ROLLBACK; 4. The four isolation levels include read not committed, read submitted, repeatable read and serialization; 5. Use transactions correctly to avoid long-term operation, turn off automatic commits, and reasonably handle locks and exceptions. Through these mechanisms, MySQL can achieve high reliability and concurrent control.
    Mysql Tutorial . Database 306 2025-07-08 02:50:41

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