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  • Designing a Robust MySQL Database Backup Strategy
    Designing a Robust MySQL Database Backup Strategy
    To design a reliable MySQL backup solution, 1. First, clarify RTO and RPO indicators, and determine the backup frequency and method based on the acceptable downtime and data loss range of the business; 2. Adopt a hybrid backup strategy, combining logical backup (such as mysqldump), physical backup (such as PerconaXtraBackup) and binary log (binlog), to achieve rapid recovery and minimum data loss; 3. Test the recovery process regularly to ensure the effectiveness of the backup and be familiar with the recovery operations; 4. Pay attention to storage security, including off-site storage, encryption protection, version retention policy and backup task monitoring.
    Mysql Tutorial . Database 648 2025-07-08 02:45:21
  • How Do You Pass Variables by Value vs. by Reference in PHP?
    How Do You Pass Variables by Value vs. by Reference in PHP?
    InPHP,variablesarepassedbyvaluebydefault,meaningfunctionsorassignmentsreceiveacopyofthedata,whilepassingbyreferenceallowsmodificationstoaffecttheoriginalvariable.1.Whenpassingbyvalue,changestothecopydonotimpacttheoriginal,asshownwhenassigning$b=$aorp
    PHP Tutorial . Backend Development 154 2025-07-08 02:42:41
  • What are some key features introduced in PHP 8 ?
    What are some key features introduced in PHP 8 ?
    PHP8 introduces a number of important new features, significantly improving performance, code readability and development experience. 1. JIT compilation improves execution speed, especially for CPU-intensive tasks, and is controlled through php.ini configuration; 2. Union types support more flexible type declarations, allowing direct definition of multiple parameter types; 3. Named parameters enhance the readability and security of function calls to avoid order errors; 4. Match expressions provide a more concise condition return method than switch, with strict comparison and non-penetration characteristics; 5. Constructor attribute improvement reduces boilerplate code, making class definition more concise; in addition, it also includes improvements such as throw expressions and attribute replacement annotations, making PHP8 more modern, powerful and easy to use overall. Although upgrades require investment,
    PHP Tutorial . Backend Development 424 2025-07-08 02:39:20
  • Configuring the InnoDB buffer pool size for MySQL performance
    Configuring the InnoDB buffer pool size for MySQL performance
    Setting the InnoDB buffer pool size should be reasonably configured according to the purpose of the server and memory resources. 1. The server dedicated to MySQL can be set to 50%~80% of the physical memory; 2. Small applications 1GB~4GB, several GB to tens of GB in medium environments, and hundreds of GB in large high-concurrency systems; 3. Use SHOWENGINEINNODBSTATUS or specific SQL query buffer pool usage; 4. Modify the configuration and set innodb_buffer_pool_size in my.cnf or my.ini and restart MySQL; 5. Pay attention to shared memory, warm-up problems and version differences in multiple instances. MySQL8.0 supports dynamic adjustment. Properly configure buffer pool energy
    Mysql Tutorial . Database 184 2025-07-08 02:38:01
  • What are some key features introduced in PHP 7 ?
    What are some key features introduced in PHP 7 ?
    PHP7introducedmajorimprovementsincludingscalartypedeclarations,returntypedeclarations,thenullcoalescingoperator,spaceshipoperator,anonymousclasses,andperformanceenhancements.First,scalartypedeclarationsallowenforcingtypeslikeint,float,bool,andstringi
    PHP Tutorial . Backend Development 976 2025-07-08 02:37:20
  • How to handle File Uploads securely in PHP?
    How to handle File Uploads securely in PHP?
    To safely handle PHP file uploads, you need to verify the source and type, control the file name and path, set server restrictions, and process media files twice. 1. Verify the upload source to prevent CSRF through token and detect the real MIME type through finfo_file using whitelist control; 2. Rename the file to a random string and determine the extension to store it in a non-Web directory according to the detection type; 3. PHP configuration limits the upload size and temporary directory Nginx/Apache prohibits access to the upload directory; 4. The GD library resaves the pictures to clear potential malicious data.
    PHP Tutorial . Backend Development 706 2025-07-08 02:37:01
  • Implementing Referential Integrity with MySQL Foreign Keys
    Implementing Referential Integrity with MySQL Foreign Keys
    Foreign key constraints ensure data consistency by associating inter-table fields. In MySQL, a foreign key is a field that references another table's primary or unique key, such as orders.user_id references users.id, to prevent orders with invalid user ID from being inserted. Supports cascading operations, including RESTRICT blocking deletion, CASCADE automatically deletes associated records, and SETNULL is set to empty (when NULL is allowed). Note when using: Only the InnoDB engine supports foreign keys, and ENGINE=InnoDB is required; the foreign key field will automatically create an index, but it is recommended to manually establish it to avoid performance differences; the field type, character set and sorting rules must be consistent; foreign keys affect transaction execution, and lock problems may be caused under high concurrency. final,
    Mysql Tutorial . Database 562 2025-07-08 02:36:21
  • What are Interfaces and Abstract Classes in PHP?
    What are Interfaces and Abstract Classes in PHP?
    An interface is a contract that defines the methods that a class must implement. A class can implement multiple interfaces; an abstract class is a semi-finished class that cannot be instantiated and can contain abstract methods and concrete implementations. Subclasses can only inherit one abstract class. For example, the Logger interface specifies a log method, and FileLogger implements it; Animal abstract class has abstract method makeSound and concrete method sleep, and Dog inherits and implements makeSound. Use interfaces to define common behaviors, such as payment interfaces; use abstract classes to adapt to shared logic, such as public methods of animal systems. Other details: The interface method defaults to public; abstract classes can have constructors; PHP8 supports interface default methods.
    PHP Tutorial . Backend Development 625 2025-07-08 02:35:40
  • Writing stored procedures and functions in MySQL
    Writing stored procedures and functions in MySQL
    The difference between stored procedures and functions is their purpose and call method: 1. Stored procedures can have multiple input and output parameters or no parameters, and are called using CALL; the function must have a return value and can only have one RETURNS value, which can be called in SELECT. 2. Before writing the storage structure, you need to use DELIMITER to replace the ending character such as // or $$ to avoid parsing the semicolon in advance, and restore the default separator after writing. 3. Variable declarations should be placed before all statements, use DECLARE to define local variables, and pay attention to the correct format of process control syntax such as IF, CASE, LOOP, and WHILE. 4. Debugging can be inserted into debug information by log table. It is recommended to add comments to explain the functions and parameters meanings, keep the logic clear, clean redundant objects regularly, and provide
    Mysql Tutorial . Database 132 2025-07-08 02:34:41
  • php get day of week
    php get day of week
    The method of getting the day of the week in PHP is as follows: 1. Use the date() function to match the 'w' or 'l' parameters to get the current week in the form of a number or English name respectively; 2. Convert it to Chinese week through a custom mapping array; 3. Use strtotime() to get the week of the specified date; 4. Pay attention to setting the time zone to ensure the accuracy of the results. For example, date('w') returns 0~6 to mean Sunday to Saturday, date('l') returns the complete English week name, and can output Chinese weekdays with a mapping array. When processing non-current dates, you need to use strtotime() to convert it to a timestamp and then pass it in date(). If the result is abnormal, check and set the correct time zone such as Asia/Shanghai.
    PHP Tutorial . Backend Development 679 2025-07-08 02:34:21
  • Using CSS `will-change` for performance hints
    Using CSS `will-change` for performance hints
    will-change is a tool that prompts browsers that some elements may change, but is not a performance magic wand. The following points should be followed when using: 1. Use only when expected to change frequently or complexly, such as transform, opacity or filter; 2. Add before the animation starts and remove after it ends; 3. Avoid global or premature application; 4. Do not abuse or retain for a long time; 5. Use performance debugging tools to judge the effect. Use correctly to optimize rendering, while using incorrectly can lead to performance degradation.
    CSS Tutorial . Web Front-end 670 2025-07-08 02:33:21
  • how to change the case of keys in a php array
    how to change the case of keys in a php array
    To change the case of PHP array keys, the most direct way is to use the built-in function array_change_key_case(), which converts all top-level keys to lowercase or uppercase, but does not handle nested arrays; if you need to modify the keys of nested arrays, you need to manually recursively handle them. 1. Use array_change_key_case($array,CASE_LOWER/UPPER) to perform rapid conversion. Note that this method only affects the top-level keys and may cause key conflict coverage issues. 2. For nested arrays, recursive functions need to be written to process them layer by layer to ensure that the string keys at each level are converted, while retaining non-string keys. 3. Pay attention to potential problems, such as duplicate keys and non-words caused by case conversion
    PHP Tutorial . Backend Development 310 2025-07-08 02:32:30
  • php date to json format
    php date to json format
    When processing dates in PHP and converting them to JSON format, it is key to make sure that the standard format is used for front-end compatibility. 1. It is recommended to use the DateTime class and format it as ISO8601 (such as YYYY-MM-DDTHH:MM:SS), because it can be directly parsed by JavaScript; 2. JSON does not support date type, date will be output in string form, and the front-end needs to use newDate() to convert the string into a date object; 3. You can choose to return a Unix time stamp, and the front-end is responsible for formatting, improving the flexibility of international projects; 4. Pay attention to the default time zone settings of the server, and it is recommended to use date_default_timezone_set() to clearly specify it; 5.
    PHP Tutorial . Backend Development 560 2025-07-08 02:31:30
  • php check if date is weekend or weekday
    php check if date is weekend or weekday
    To determine whether the date is a weekend or a working day, it is mainly implemented through PHP's date function. 1. Use the date() function to combine the format parameters 'N' or 'w' to get the day of the week, where 'N' returns 1 (Monday) to 7 (Sunday), and if the value is greater than or equal to 6, it is the weekend; 2. Define differences for weekends in different regions, and match judgments can be made by customizing weekend arrays; 3. You can also use the DateTime class to implement the same logic, and the structure is clearer and easier to maintain. The above methods only deal with weekend judgments, and additional data is required for holidays.
    PHP Tutorial . Backend Development 794 2025-07-08 02:30:40

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