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  • What are PHP PSR standards and why are they important?
    What are PHP PSR standards and why are they important?
    PSRstandardsareasetofcodingguidelinescreatedbyPHP-FIGtopromoteconsistencyandinteroperabilityacrossPHPprojects.TheyincludePSR-1,whichcoversbasiccodingstandardslikeproperuseofPHPtagsandnamingconventions;PSR-4,whichdefinesanautoloadingstandardforclassfi
    PHP Tutorial . Backend Development 775 2025-07-12 02:14:11
  • PHP str_replace using an array for search and replace
    PHP str_replace using an array for search and replace
    PHP's str_replace function supports batch replacement of strings through arrays. 1. One-to-one replacement: Set $search and $replace as arrays, replace one by one in order, such as ['apple','banana'] with ['fruit A','fruit B']; 2. Unified replacement: $search is an array, $replace is a single string, and all matches are replaced with this string, such as ['cat','dog','bird'] with 'animal'; 3. Notes: str_replace is case sensitive, and str_ireplace can ignore case; the replacement order affects the result, and the first match is preferred.
    PHP Tutorial . Backend Development 498 2025-07-12 02:13:51
  • What is the CSS calc() function and what are its use cases?
    What is the CSS calc() function and what are its use cases?
    TheCSScalc()functionenablesdynamicmathematicalcalculationswithinstylesheets.Itsupportsoperationslikeaddition,subtraction,multiplication,anddivision,allowingdeveloperstomixunitsandadjustsizesonthefly.1.Alwaysusespacesaround and-operators.2.Itsimplifie
    CSS Tutorial . Web Front-end 685 2025-07-12 02:13:41
  • Implementing smooth scrolling experiences with CSS Scroll Snap
    Implementing smooth scrolling experiences with CSS Scroll Snap
    CSSScrollSnap can create a smooth scrolling experience, suitable for scenes such as horizontal sliding, paging scrolling, etc. 1. Set the container to use overflow and scroll-snap-type, and add scroll-snap-align to achieve alignment in the child; 2. The scrolling direction can be selected as x or y axis, and the adsorption behavior is controlled through mandatory or proximity; 3. Common problems include unclear container size, child not full of viewport or abnormal stacking context, fixed size and min-width/height should be set; 4. Combined with scroll-behavior to achieve smooth scrolling, and combined with overscroll-behavior to control the boundary
    CSS Tutorial . Web Front-end 860 2025-07-12 02:13:21
  • PHP strip_tags how to allow some tags
    PHP strip_tags how to allow some tags
    strip_tags can specify the reserved HTML tags through the second parameter. For example, strip_tags($input,'') can retain and tag. Common retained tags include,,,,,,, and (need to be used with caution). When using, you should avoid retaining,,, and other dangerous tags, and pay attention to the security of src. In actual applications, it is recommended to test and combine functions such as htmlspecialchars to ensure security.
    PHP Tutorial . Backend Development 473 2025-07-12 02:12:41
  • How to measure the memory usage of a single PHP function call?
    How to measure the memory usage of a single PHP function call?
    To measure memory usage of a single PHP function call, use the memory_get_usage() and memory_get_peak_usage() functions. 1. Use memory_get_usage() to obtain the memory difference before and after function execution to calculate the actual increased memory usage; 2. Use memory_get_peak_usage() to obtain the maximum memory peak during function execution, including temporary memory allocated; 3. For more in-depth analysis, enable Xdebug extension to generate performance analysis files, and combine tools such as KCacheGrind to view detailed memory and time consumption, but it should be noted that Xdebug is only applicable to the development environment and should not be produced.
    PHP Tutorial . Backend Development 720 2025-07-12 02:12:20
  • How to add and style a blockquote in HTML?
    How to add and style a blockquote in HTML?
    Using HTML blockquote tags can effectively highlight the referenced content and beautify the style with CSS. 1. The basic usage is to wrap the quotation content in the tag, and the browser will add indentation by default; 2. Set properties such as margin, padding, border, color, etc. through CSS, which can make the quotation more eye-catching; 3. You can indicate the source in combination with the tag, and enhance the sense of hierarchy through right alignment and other styles; 4. Appropriately adjust the font, background color and spacing, so that the quotation block style can be unified and easy to read.
    HTML Tutorial . Web Front-end 826 2025-07-12 02:10:32
  • how to enable general query log in mysql
    how to enable general query log in mysql
    The general query log can be enabled through commands or configuration files. 1. Check the status with SHOWVARIABLESLIKE'general_log%'; check whether it is ON; 2. Temporarily enable SETGLOBALgeneral_log=ON; restart fails; 3. Permanently enable general_log=1 and specified log path in my.cnf and restart MySQL service; 4. Pay attention to performance impact, disk space occupation, risk of sensitive data leakage and log format optional file or table storage.
    Mysql Tutorial . Database 286 2025-07-12 02:09:50
  • How to store PHP sessions in Redis or Memcached?
    How to store PHP sessions in Redis or Memcached?
    Use Redis or Memcached instead of default file storage to improve PHP session performance and scalability, including: 1. The file locking mechanism is prone to blocking; 2. It does not support cross-server sharing sessions; 3. The cleaning mechanism is inflexible. Redis and Memcached are memory-based storage, fast speed, support expiration mechanisms, and are suitable for distributed environments. The configuration steps are: install the corresponding extension and modify the parameters such as session.save_handler and session.save_path in php.ini. Redis supports persistence and has higher reliability, while Memcached is lighter and suitable for caching. Notes include: 1. Set up a degradation strategy for connection failure; 2.
    PHP Tutorial . Backend Development 811 2025-07-12 02:09:30
  • Analyzing Query Execution with MySQL EXPLAIN
    Analyzing Query Execution with MySQL EXPLAIN
    MySQL's EXPLAIN is a tool used to analyze query execution plans. You can view the execution process by adding EXPLAIN before the SELECT query. 1. The main fields include id, select_type, table, type, key, Extra, etc.; 2. Efficient query needs to pay attention to type (such as const, eq_ref is the best), key (whether to use the appropriate index) and Extra (avoid Usingfilesort and Usingtemporary); 3. Common optimization suggestions: avoid using functions or blurring the leading wildcards for fields, ensure the consistent field types, reasonably set the connection field index, optimize sorting and grouping operations to improve performance and reduce capital
    Mysql Tutorial . Database 981 2025-07-12 02:07:21
  • PHP base64_encode and base64_decode example
    PHP base64_encode and base64_decode example
    Base64 encoding is used in PHP to convert binary data into string format for easy transmission or storage. 1. The base64_encode() function is often used to process the transmission of images, file contents or special characters, such as embedding PNG icons into HTML dataURI to display; 2. The base64_decode() function is used to restore encoded data, such as decoding user information in the API interface; 3. Note when using: Base64 encoding will increase the data volume by about 33%, and cannot be used to encrypt sensitive information. Ulencode processing should be performed when used in URLs or cookies, and the received data needs to be formatted verification to avoid decoding failure.
    PHP Tutorial . Backend Development 612 2025-07-12 02:06:51
  • what is a primary key in mysql
    what is a primary key in mysql
    AprimarykeyinMySQLisaconstraintthatuniquelyidentifieseachrowinatable.1.Itensuresdatauniquenessandnon-nullvalues,eitherinasinglecolumnoracombinationofcolumns.2.Everytableshouldhaveaprimarykeytoenforceentityintegrityandallowreliabledistinctionbetweenre
    Mysql Tutorial . Database 148 2025-07-12 02:06:31
  • How do PHP sessions work in frameworks like Laravel or Symfony?
    How do PHP sessions work in frameworks like Laravel or Symfony?
    PHPsessionsinframeworkslikeLaravelandSymfonyfunctionsimilarlytoplainPHPbutwithabstractionandconvenience.1.Sessionsareautomaticallystartedviamiddleware—LaravelusesStartSession,whileSymfonyusesSessionListener.2.Sessiondataisstoredbydefaultinfiles,butbo
    PHP Tutorial . Backend Development 203 2025-07-12 02:01:01
  • mysql error 1215 cannot add foreign key constraint
    mysql error 1215 cannot add foreign key constraint
    MySQL error "Error1215:Cannotaddforeignkeyconstraint" is usually caused by the foreign key setting that does not meet the prerequisites. 1. Data type mismatch: The data type, length, and symbol attributes of the foreign key and the primary key field must be the same; 2. The engine is inconsistent: Only the InnoDB engine supports foreign keys, so make sure that the table uses InnoDB; 3. Different character sets or sorting rules: It is recommended to unify the character set and sorting rules; 4. The field is not indexed: the foreign key field should be explicitly indexed; 5. The table or field name is incorrectly spelled: it is necessary to check whether it exists and whether it is spelled correctly. During the investigation, the above reasons can be corrected one by one.
    Mysql Tutorial . Database 923 2025-07-12 01:59:22

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