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  • 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 444 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 275 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 967 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 140 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 361 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 349 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 458 2025-07-13 01:40:01
  • mysql unique index vs primary key
    mysql unique index vs primary key
    Both the primary key (PrimaryKey) and Unique Index (UniqueIndex) ensure data uniqueness, but there are the following differences: 1. The primary key is used to uniquely identify each row of data, and cannot be empty and there can only be one in a table; 2. The primary key automatically creates a clustered index, affecting the data storage order; 3. The unique index can be empty and allows multiple NULL values, and a table can have multiple; 4. The unique index is a non-clustered index by default, and does not change the physical storage order; 5. The primary key is suitable for non-empty unique identifiers, such as self-incremental ID; 6. The unique index is suitable for field unique restrictions of business logic, such as username, mailbox, etc.
    Mysql Tutorial . Database 532 2025-07-13 01:37:31
  • Choosing between CSS Grid and Flexbox for layout tasks
    Choosing between CSS Grid and Flexbox for layout tasks
    Flexbox is more suitable for one-dimensional layouts, such as navigation bars and button groups; Grid is more suitable for two-dimensional layouts, such as the overall structure of the page. Flexbox is good at flexible alignment and responsive arrangement of single rows or single columns, suitable for horizontal or vertical centering and internal content layout of cards; Grid supports simultaneous control of rows and columns, suitable for complex page frames, dashboards and other scenarios. Judgment criteria: Flexbox is used for one-dimensional layout, Grid is used for two-dimensional layout; Grid is preferred for multiple independent areas, and Flexbox is used for alignment and sorting dynamic scaling. The two can also be mixed, such as Grid as structure, and internal blocks are arranged using Flexbox. Tips: Grid named area improves readability, Flex children need to add flex-wrap to wrap
    CSS Tutorial . Web Front-end 998 2025-07-13 01:31:01
  • how to escape special characters in php regex
    how to escape special characters in php regex
    The key to handling special characters in PHP regular expressions is to use backslashes for escape. 1. The purpose of escape is to allow the regular engine to treat special characters as ordinary characters to avoid matching failures or syntax errors; 2. Common characters that need to be escaped include ., ^, $, *, , ?, {,}, [,], (,), \, |, :, =,!, etc.; 3. You can use the preg_quote function to efficiently escape the entire string automatically, and pay attention to adding delimiters; 4. Indicating an actual backslash in the string, you need to write two backslashes to ensure that they are correctly passed to the regular engine; 5. When using it, it is recommended to use online tools to test and confirm the role of characters to improve accuracy and efficiency. Master these key points to correctly handle the special features in PHP regulations
    PHP Tutorial . Backend Development 405 2025-07-13 01:29:21
  • mysql flush privileges what it does
    mysql flush privileges what it does
    FLUSHPRIVILEGES is used to reload MySQL's permission table so that manual modified permissions take effect immediately. 1. When directly modifying system tables such as mysql.user or mysql.db, you must execute this command to load the changes from disk to memory; 2. When using standard permission management statements such as GRANT, REVOKE, CREATEUSER, etc., you do not need to execute this command because the permissions have been automatically refreshed; 3. This command will not restart the service, repair configuration errors, or disconnect the current connection, and only notify MySQL to reread the authorization table content.
    Mysql Tutorial . Database 412 2025-07-13 01:27:31
  • How does the lang attribute on the tag work?
    How does the lang attribute on the tag work?
    ThelangattributeinHTMLspecifiesthelanguageofcontent,improvingaccessibility,SEO,andbrowserfunctionality.1.Ithelpsscreenreadersapplycorrectpronunciationrules.2.Itassistssearchenginesinclassifyingcontentbylanguage.3.Itinfluencesbrowserfeaturesliketransl
    HTML Tutorial . Web Front-end 652 2025-07-13 01:25:42
  • PHP substr_count usage
    PHP substr_count usage
    The substr_count function is used to count the number of occurrences of substrings. The syntax is substr_count($haystack,$needle), for example, counting the number of occurrences of "apple"; note points include: 1. Manual conversion and unified conversion are required for case sensitivity; 2. Overlapping matches are not handled, such as "aa" in "aaa" only counts twice; 3. The parameter order cannot be reversed; 4. Multi-byte characters need to be expanded by mbstring; application techniques such as combining str_replace to judge replacement, filter keyword frequency, and avoid misjudgment of empty strings.
    PHP Tutorial . Backend Development 801 2025-07-13 01:21:40
  • Structuring CSS with methodologies like BEM or SMACSS
    Structuring CSS with methodologies like BEM or SMACSS
    BEM and SMACSS are two structured CSS methods that are suitable for different project requirements. BEM (BlockElementModifier) uses naming rules to clarify component relationships, solve class name conflicts, maintenance difficulties and other problems, and is suitable for component libraries or modular projects; SMACSS (Scalable and Modular Architecture for CSS) structurally divides styles into Base, Layout, Module, State and Theme, which is suitable for hierarchical management of large websites. The two can be used in combination, and the key is to maintain consistency, avoid over-necking, rationalize the use of tools and provide training documents to improve code maintainability and team collaboration efficiency.
    CSS Tutorial . Web Front-end 580 2025-07-13 01:20:01

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