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  • How to use PHP Composer for dependency management?
    How to use PHP Composer for dependency management?
    Composer solves many problems in PHP dependency management. 1. Install Composer: Windows users use graphical installation programs, Linux/macOS users download and move to the system path through commands; 2. Initialize the project: Run composerinit to create composer.json file; 3. Add dependencies: manually edit the file or use composerrequire command to install the package; 4. Automatic loading: introduce vendor/autoload.php to achieve automatic loading of the class library, and custom classes can be automatically loaded by configuring the autoload field; 5. Update and unload dependencies: use composerupda respectively
    PHP Tutorial . Backend Development 685 2025-07-13 02:00:51
  • how to check which storage engine is used in mysql
    how to check which storage engine is used in mysql
    The method of viewing the storage engine of MySQL is as follows: 1. You can use the command SHOWVARIABLESLIKE'default_storage_engine'; 2. You can use the storage engine used to view a certain table to view the storage engine through SHOWCREATETABLE or query information_schema.TABLES; 3. You can use SELECTTABLE_NAME,ENGINEFROMinformation_schema.TABLESWHERETABLE_SCHEMA='your_database'; 4. Other methods include on the command line
    Mysql Tutorial . Database 697 2025-07-13 02:00:35
  • What are HTML landmark roles for accessibility?
    What are HTML landmark roles for accessibility?
    HTMLlandmarkrolesarespecialARIAattributesthathelpscreenreaderusersnavigateawebpagemoreeasilybydefiningkeysectionssuchasmaincontent,navigation,andsearch.1.Userole="navigation"formenusandlinkstoallowuserstojumpdirectlytoorbypassthem;2.Applyro
    HTML Tutorial . Web Front-end 750 2025-07-13 01:58:41
  • What is the best way to structure an HTML document for SEO?
    What is the best way to structure an HTML document for SEO?
    TostructureanHTMLdocumentforSEO,usesemanticHTMLtags,optimizeheadingstructure,placeimportantcontentearly,andaddmetatagsandstructureddata.First,replacegenericelementswithsemantictagslike,,,,,andtoimproveclarityandaccessibility.Second,followalogicalhead
    HTML Tutorial . Web Front-end 599 2025-07-13 01:58:12
  • How do you prevent Cross-Site Request Forgery (CSRF) in php applications?
    How do you prevent Cross-Site Request Forgery (CSRF) in php applications?
    To prevent CSRF attacks in PHP applications, you need to use anti-CSRF tokens, verify HTTP methods, set SameSiteCookie attributes, and consider using a framework that automatically handles CSRF. 1. Use anti-CSRF token: the server generates a unique token and associates it with the user session, adds a hidden field to the form to submit the token, and verify whether the token matches when submitting; 2. Verify HTTP method: Ensure that sensitive operations are only performed through secure methods such as POST, and rejects unanticipated GET requests; 3. Set SameSiteCookie attribute: Configure SameSite=Strict or Lax through session_set_cookie_params to prevent cross-site requests
    PHP Tutorial . Backend Development 825 2025-07-13 01:56:31
  • How to add padding to a string with str_pad
    How to add padding to a string with str_pad
    PHP's str_pad() function is used to add padding characters at both ends of a string to reach the specified length. Its syntax is str_pad($input,$pad_length,$pad_string="",$pad_type=STR_PAD_RIGHT); 1. The basic usage is to make up the length, such as str_pad("42", 5,"0",STR_PAD_LEFT) output "00042"; 2. The filling direction can be controlled, including the right (default), left or both sides, such as str_pad("hello&q
    PHP Tutorial . Backend Development 351 2025-07-13 01:56:10
  • How to use intersection types for function parameters in PHP 8.1?
    How to use intersection types for function parameters in PHP 8.1?
    PHP8.1 introduces intersection types, and uses the & operator to specify that values must satisfy multiple type constraints at the same time. 1. When the intersection type is used for function parameters, ensure that the object implements multiple interfaces, such as function example (FooInterface&BarInterface$param). 2. Usage scenarios include designing APIs or libraries that require combination capabilities, and enhancing type safety when combined with mixin and trait. 3. Practical recommendations: Only used for object types and variable naming, the meaning of combination types should be clearly expressed and excessive nesting should be avoided. 4. Modern IDE and static analysis tools such as PHPStan have well supported this feature. 5. Pay attention to the intersection type that requires the object to be completed
    PHP Tutorial . Backend Development 218 2025-07-13 01:55:30
  • PHP preg_quote to escape regex characters
    PHP preg_quote to escape regex characters
    When processing regular expressions, when you need to insert user input or external data into the regular as a literal string, you need to use the preg_quote() function to escape special characters. 1. When a variable contains special characters in a regular (such as ., *, , ?) and is spliced into a regular expression, it will cause abnormal matching behavior; 2. The first parameter of preg_quote() is a string to be escaped, and the second parameter is used to specify the regular separator to ensure that the separator itself is also escaped; 3. Common misunderstandings include abuse of preg_quote(), ignoring the delimiter parameters, and mistakenly thinking that it can solve all security problems; 4. In practical applications, it is recommended to always use preg_quote() to deal with dynamic content.
    PHP Tutorial . Backend Development 450 2025-07-13 01:54:10
  • Why use prepared statements in PHP
    Why use prepared statements in PHP
    Use prepared statements in PHP mainly to prevent SQL injection attacks, improve performance, make the code clearer and easier to debug. 1. It effectively prevents SQL injection through parameterized queries, ensuring that user input is always processed as data rather than SQL logic; 2. Preprocessing statements only need to be compiled once when executed multiple times, significantly improving execution efficiency, especially suitable for batch operations; 3. Parameter binding supports position and named placeholders, separates SQL and data, and enhances code readability and maintenance; 4. Errors can be exposed in advance in the prepare stage, and exceptions can be handled uniformly by setting error mode, which helps to quickly debug.
    PHP Tutorial . Backend Development 284 2025-07-13 01:52:51
  • mysql table partitioning example
    mysql table partitioning example
    MySQL table partition improves query performance and management efficiency by splitting big data into different physical storage. 1. Partition types include RANGE, LIST, HASH, and KEY, where RANGE is divided by value range and is suitable for time-class data; 2. To create a partition table, you need to specify a partition key (such as partitioning by year), and reasonably set the partition boundary; 3. When querying, you must use the partition key directly and avoid function wrapping to ensure that trigger partition cropping improves performance; 4. The partition key must be part of the primary key or unique index, otherwise the partition table cannot be created; 5. The partition structure needs to be maintained regularly, such as adding future years partitions to avoid data being concentrated in the bottom-up partition.
    Mysql Tutorial . Database 968 2025-07-13 01:52:30
  • How does php handle sessions and cookies?
    How does php handle sessions and cookies?
    PHPmanagessessionsandcookiestomaintainstateacrossHTTPrequests.1.Sessionsstoredataserver-side,usingauniquesessionIDstoredtypicallyinacookie(PHPSESSID).2.Cookiesstoredataclient-side,setviasetcookie()andaccessedthrough$_COOKIE.3.Sessionsaresaferforsensi
    PHP Tutorial . Backend Development 147 2025-07-13 01:50:11
  • Strategies for MySQL Query Performance Optimization
    Strategies for MySQL Query Performance Optimization
    MySQL query performance optimization needs to start from the core points, including rational use of indexes, optimization of SQL statements, table structure design and partitioning strategies, and utilization of cache and monitoring tools. 1. Use indexes reasonably: Create indexes on commonly used query fields, avoid full table scanning, pay attention to the combined index order, do not add indexes in low selective fields, and avoid redundant indexes. 2. Optimize SQL queries: Avoid SELECT*, do not use functions in WHERE, reduce subquery nesting, and optimize paging query methods. 3. Table structure design and partitioning: select paradigm or anti-paradigm according to read and write scenarios, select appropriate field types, clean data regularly, and consider horizontal tables to divide tables or partition by time. 4. Utilize cache and monitoring: Use Redis cache to reduce database pressure and enable slow query
    Mysql Tutorial . Database 369 2025-07-13 01:45:20
  • Implementing responsive images with CSS properties like object-fit
    Implementing responsive images with CSS properties like object-fit
    To make the images appear properly on different devices, object-fit, responsive layout and srcset technology are required. 1.Object-fit controls the image scaling method. Common values include fill, contain, cover, scale-down, which is suitable for img and video elements; 2. Use @media query to realize layout adjustments under different screens, such as full width of the mobile phone and side-by-side display on the desktop; 3. Through srcset and sizes, let the browser select appropriate image resources according to the viewport to improve loading performance; 4. Pay attention to setting width and height to prevent layout jitter, avoid misuse of object-fit in the background image, optimize the quality of the original image and fully test compatibility.
    CSS Tutorial . Web Front-end 356 2025-07-13 01:40:41
  • What is polymorphism in php OOP and how is it achieved?
    What is polymorphism in php OOP and how is it achieved?
    PolymorphisminPHPOOPallowsdifferentclassestobetreatedasobjectsofacommonsuperclassorinterfacewhilemaintainingtheiruniquebehaviors.1.Itisachievedprimarilythroughmethodoverriding,whereasubclassredefinesamethodfromitsparentclass,enablingdistinctresponses
    PHP Tutorial . Backend Development 463 2025-07-13 01:40:01

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