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  • 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 717 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 821 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 281 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 805 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 976 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 607 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 146 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 199 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 920 2025-07-12 01:59:22
  • Advanced CSS Keyframe animation techniques and control
    Advanced CSS Keyframe animation techniques and control
    CSSkeyframe animation can achieve delicate and complex effects through techniques. 1. Use animation-timing-function to refine the rhythm, such as the first half of ease-in the second half of ease-out; 2. Control the playback state through animation-play-state and animation-direction to achieve pause, reverse, and back-and-forth playback; 3. Use commas to separate multi-layer animation overlays to create combined animation effects; 4. Dynamically adjust animation parameters in combination with JavaScript, such as modifying CSS variables to change the duration or direction. Mastering these techniques can improve animation fluency, controllability and interactivity.
    CSS Tutorial . Web Front-end 823 2025-07-12 01:57:11
  • Explain the difference between `==` and `===` operators in php.
    Explain the difference between `==` and `===` operators in php.
    The difference between == and == in PHP is that: == is a loose comparison, only the values ??are compared and type conversion is performed, for example, 0=="0" is true; while === is a strict comparison, which compares both values ??and types, such as 0==="0" is false. Common type conversion rules include converting a string to a number when compared to a number, converting a Boolean value to 0 or 1, etc. It is recommended to use === first to avoid unexpected errors. For example, when checking the return value of strpos(), you must use === to determine whether it is false.
    PHP Tutorial . Backend Development 973 2025-07-12 01:54:30
  • php best way to store date in database
    php best way to store date in database
    The safest way to save dates to the database in PHP is: 1. Select the appropriate data type (DATETIME is suitable for long-term storage, TIMESTAMP is suitable for automatic time zone conversion); 2. Use the DateTime class to process time and the unified format is 'Y-m-dH:i:s'; 3. Use UTC in the unified time zone and set the time zone when connecting to MySQL. Avoid storing timestamps directly or using irregular formats to ensure queries, sorting, and cross-language compatibility.
    PHP Tutorial . Backend Development 263 2025-07-12 01:52:41
  • Managing user accounts and granular privileges in MySQL
    Managing user accounts and granular privileges in MySQL
    MySQL user permission management must follow the principle of minimum permissions to avoid abuse of root accounts. 1. When creating a user, use the CREATEUSER statement to ensure that there is no permission at the beginning; 2. When authorizing, assign specific permissions such as SELECT and INSERT rather than all permissions as needed; 3. Use GRANT and REVOKE to accurately control and recycle permissions; 4. Check permissions regularly and clean up accounts that are no longer needed; 5. Use wildcards to achieve flexible authorization but use them with caution. These methods can improve database security and reduce risks.
    Mysql Tutorial . Database 320 2025-07-12 01:52:20
  • how to install mysql on ubuntu
    how to install mysql on ubuntu
    The steps to install MySQL on Ubuntu include: 1. Update the system package and install MySQL; 2. Run the secure initialization script to set the root password, disable remote login, etc.; 3. Check the service status and perform basic operations; 4. Handle possible permissions and login problems. First update the package list, execute sudoaptupdate and sudoaptinstallmysql-server to install MySQL, and then configure security options through sudomysql_secure_installation to ensure that strong passwords are set and remote access is disabled according to requirements. After the installation is completed, use the systemctl command to manage the service status and use sudom
    Mysql Tutorial . Database 689 2025-07-12 01:51:11

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