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  • How to create an overlapping layout with CSS Grid?
    How to create an overlapping layout with CSS Grid?
    The key to using CSSGrid to achieve a cascade layout is the cooperation of grid-area and z-index. 1. Set the row and column ranges of different elements through grid-area to make them overlap in position; 2. Use position and z-index to control the stacking order of elements to let specific elements be displayed on the upper layer; 3. You can combine translucent background to achieve visual fusion effect; 4. For complex layouts, you can use grid-template-areas to name areas to simplify the structure, and manually specify the coverage area through grid-area. Mastering these methods can flexibly achieve various stacked layout effects.
    CSS Tutorial . Web Front-end 827 2025-07-13 02:56:10
  • How do you perform unit testing for php code?
    How do you perform unit testing for php code?
    UnittestinginPHPinvolvesverifyingindividualcodeunitslikefunctionsormethodstocatchbugsearlyandensurereliablerefactoring.1)SetupPHPUnitviaComposer,createatestdirectory,andconfigureautoloadandphpunit.xml.2)Writetestcasesfollowingthearrange-act-assertpat
    PHP Tutorial . Backend Development 911 2025-07-13 02:54:31
  • How do PHP sessions work with AJAX requests?
    How do PHP sessions work with AJAX requests?
    PHPsessionsworkwithAJAXrequestssimilarlytoregularpagerequestsbutrequireattentiontopersistence,blocking,andcross-domainissues.1.SessionsstartandpersistviathePHPSESSIDcookie,whichbrowsersautomaticallysendwithAJAXrequestsaslongassession_start()iscalledi
    PHP Tutorial . Backend Development 458 2025-07-13 02:53:50
  • Describe the Concept of CSRF and How to Protect Against it in PHP
    Describe the Concept of CSRF and How to Protect Against it in PHP
    CSRF attacks are used to fake requests using the user's logged in identity. Specifically, the attacker induces users to access malicious websites, sends requests in the user's name without the user's knowledge, and performs non-intentional operations. A common way to prevent CSRF is to use the CSRFTToken mechanism, 1. Generate a unique random token; 2. Save the token in the Session and form hidden fields; 3. Compare whether the two are consistent when submitting. Other protection methods include checking the Referer header, setting the SameSiteCookie attribute, and introducing a verification code mechanism. Easy to ignore points include AJAX request not token, token generation is unsafe, and token storage into cookies incorrectly. The correct way is to only
    PHP Tutorial . Backend Development 290 2025-07-13 02:53:31
  • Choosing Appropriate Data Types in MySQL
    Choosing Appropriate Data Types in MySQL
    Selecting the right data type in MySQL can improve performance and storage efficiency. 1. Select fixed-length CHAR or variable-length VARCHAR according to the field length, and use TINYINT in the status field first; 2. Use DATE, DATETIME or TIMESTAMP as required for the time type to avoid using INT to store timestamps; 3. Use TEXT/BLOB to give priority to VARCHAR to reduce I/O overhead; 4. Use ENUM type or independent table to enumerate values to improve data standardization and query efficiency.
    Mysql Tutorial . Database 288 2025-07-13 02:53:00
  • What is the purpose of the content property in pseudo-elements?
    What is the purpose of the content property in pseudo-elements?
    The content attribute is used in CSS to insert generated content into a pseudo-element. Its core role is to add visual content in non-HTML structures, such as text, symbols, pictures, or automatic counters. 1. Insert text or symbols: can be used to add labels or icons, such as "Note:" or Unicode characters; 2. Add images or counters: supports inserting pictures and implementing automatic numbering; 3. Style control: styles such as fonts, colors and layouts can be applied to the generated content; 4. Use restrictions: It should be avoided to use critical information or large amounts of text to avoid affecting accessibility and maintenance.
    CSS Tutorial . Web Front-end 844 2025-07-13 02:50:50
  • what is a covering index in mysql
    what is a covering index in mysql
    Overwrite indexes in MySQL are indexes that contain all columns required for a query, thus avoiding access to actual table data. It reduces I/O by eliminating table searches and improves query speed. For example, when SELECTidFROMusersWHEREstatus='active' is executed, if there is a composite index of (status,id), it constitutes an overlay index. The best scenarios for using overlay indexes include: 1. Query involves only a small number of columns; 2. Aggregated queries such as COUNT or SUM; 3. High-frequency conditional queries. To identify an overwrite index opportunity, view the Extra column in the EXPLAIN output. If “Usingindex” is displayed, the overwrite index is used. All the query should be included when designing
    Mysql Tutorial . Database 576 2025-07-13 02:47:50
  • How to structure the semantic parts of an html table (thead, tbody, tfoot)?
    How to structure the semantic parts of an html table (thead, tbody, tfoot)?
    Use, and can add clear semantic structure to HTML tables. 1. It is used to wrap the content of the table header. It is recommended to use labels and enhance semantics with scope="col" and can also repeat the table header when printing; 2. Although it is not mandatory, it is recommended to facilitate content grouping, style control and script operations. A table can contain multiple; 3. It can be used to place summary information such as totals. It can be placed between or after it is placed, and the browser will still correctly render it at the bottom. Correct use of these three tags can improve the accessibility, maintainability and semantic expression capabilities of tables.
    HTML Tutorial . Web Front-end 313 2025-07-13 02:47:31
  • how to create user in mysql
    how to create user in mysql
    To create MySQL users, you need to pay attention to syntax and permission settings. First, use CREATEUSER to specify the user name, host name and password, such as CREATEUSER'testuser'@'localhost'IDENTIFIEDBY'password123'; if you want to allow any IP to log in, change localhost to %. Secondly, the permissions are allocated through the GRANT command, such as GRANTALLPRIVILEGESONtestdb.*TO'testuser'@'localhost'; Common permissions include SELECT, INSERT, UPDATE, DELETE, CREATE, DROP and AL
    Mysql Tutorial . Database 640 2025-07-13 02:47:01
  • How to use PHP sessions with a different domain or cross-domain?
    How to use PHP sessions with a different domain or cross-domain?
    The answer is: PHP native session is only available for single domain names by default, but can be shared across domains through manual intervention. 1. Explicitly pass the sessionID, pass it through URL parameters or custom header and set session_id in the target domain name; 2. Share the session storage backend, such as using Redis, Memcached or NFS shared directory; 3. Set the domain attribute of the cookie to be suitable for subdomain sharing; 4. Use advanced solutions such as OAuth, JWT or SSO to replace the direct sharing session to improve security and scalability. The above methods need to be combined with HTTPS and security control to prevent risks.
    PHP Tutorial . Backend Development 363 2025-07-13 02:46:11
  • mysql user defined functions (udf)
    mysql user defined functions (udf)
    MySQLUDF is a user-defined function written in C/C and compiled into a shared library and registered with MySQL for efficient implementation of specific logic. 1. UDF is suitable for computing operations such as string processing, mathematical operations, etc., and the execution efficiency is higher than that of stored procedures; 2. The creation steps include writing code, compiling into .so files, placing them in MySQL accessible directory, and registering and using them through CREATEFUNCTION; 3. When using them, you need to pay attention to compatibility, stability, debugging difficulty and deployment complexity. It is recommended to only be used when high-performance requirements and SQL is difficult to implement; 4. Alternative solutions include storage functions, triggers, application layer processing or MySQL plug-in system, which can be selected according to actual needs.
    Mysql Tutorial . Database 676 2025-07-13 02:45:20
  • mysql date_add function
    mysql date_add function
    MySQL's DATE_ADD function is used to add a specified time interval to a date or time value. Its basic syntax is DATE_ADD(date,INTERVALexprunit), where date is the original date or time, INTERVAL is the keyword, expr is the increased number, and unit is the time unit such as DAY, MONTH, etc. 1. It is often used to calculate future time points, such as one day's reminder after registration, member validity period, etc.; 2. It can be used in combination with other functions, such as using CURDATE() to obtain yesterday's data, or NOW() to query future appointments; 3. When using it, you need to pay attention to the correctness of the date format, unit spelling, negative number use and cross-month/year boundary issues. Mastering this function helps
    Mysql Tutorial . Database 657 2025-07-13 02:45:01
  • Using the MySQL Shell for administration and scripting
    Using the MySQL Shell for administration and scripting
    The method of MySQLShell to connect to the database is to use the mysqlsh command to start and enter connection information, or directly specify user@host:port on the command line; 1. The startup method is flexible, supports interactive input or directly specifying parameters; 2. Pay attention to SSL settings and authentication methods, especially when remote connections, to ensure the correct permissions and passwords; 3. After entering the shell, it is SQL mode by default, and can perform regular SQL operations; 4. Support switching to JS or Python mode to write complex scripts to realize automated tasks; 5. Script writing requires attention to mode selection, output format, exception handling and file saving; 6. Provide practical tips, such as viewing the current mode, switching paths, multi-instance connections, and checking help articles
    Mysql Tutorial . Database 628 2025-07-13 02:43:51
  • How do you comment out a block of HTML?
    How do you comment out a block of HTML?
    TocommentoutHTMLblocks,usethesyntax.ThismethodallowsdeveloperstotemporarilydisablesectionsofHTMLcodewithoutdeletingthem,ensuringthecontentisignoredbybrowsersbutremainsvisibleinthepagesource.It'susefulfortesting,collaboration,andA/Btesting.However,its
    HTML Tutorial . Web Front-end 560 2025-07-13 02:42:12

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