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  • mysql temporary table vs memory table
    mysql temporary table vs memory table
    Temporary tables are tables with limited scope, and memory tables are tables with different storage methods. Temporary tables are visible in the current session and are automatically deleted after the connection is disconnected. Various storage engines can be used, which are suitable for saving intermediate results and avoiding repeated calculations; 1. Temporary tables support indexing, and multiple sessions can create tables with the same name without affecting each other; 2. The memory table uses the MEMORY engine, and the data is stored in memory, and the restart is lost, which is suitable for cache small data sets with high frequency access; 3. The memory table supports hash indexing, and does not support BLOB and TEXT types, so you need to pay attention to memory usage; 4. The life cycle of the temporary table is limited to the current session, and the memory table is shared by all connections. When choosing, it should be decided based on whether the data is private, whether high-speed access is required and whether it can tolerate loss.
    Mysql Tutorial . Database 567 2025-07-13 02:23:50
  • How to check if a string is valid JSON in PHP
    How to check if a string is valid JSON in PHP
    The method to verify whether a string is legal in PHP is to use json_decode to judge the parsing result with json_last_error. The specific steps are as follows: 1. Use json_decode to try to parse the string; 2. Check whether there is an error through json_last_error. If JSON_ERROR_NONE is returned, it means that it is legal; 3. For empty strings or simple values such as "null", you need to judge the type according to business needs; 4. If the expected result is an array, you can add is_array verification; 5. When processing unreliable input, it is recommended to use trim to remove the whitespace, and note that single quotes should be replaced with double quotes.
    PHP Tutorial . Backend Development 678 2025-07-13 02:21:31
  • How to include one HTML file in another?
    How to include one HTML file in another?
    To introduce another HTML file into HTML, it can be done in a variety of ways. First, use iframes to embed content, which is suitable for independent modules but is not conducive to SEO and style adaptation; second, use JavaScript to dynamically load HTML fragments, which are flexible and controllable, but are limited by cross-domain problems; third, use server-side inclusion (SSI), which is conducive to SEO but requires server configuration; fourth, it is automatic merging of HTML through construction tools, which is suitable for large projects but has high learning costs. Just choose the right method according to your needs.
    HTML Tutorial . Web Front-end 202 2025-07-13 02:20:52
  • How to get a string between two other strings in PHP
    How to get a string between two other strings in PHP
    To extract content from between two strings, you can use PHP's strpos() and substr() functions to implement it. First, find the position of the starting mark and calculate its end point, then find the starting position of the end mark, and finally use substr() to intercept the intermediate content. 1. Use strpos() to locate the starting mark position, and return an empty string if not found; 2. Calculate the actual starting position after the starting mark; 3. Use strpos() to search for the end mark position from the starting position, and return an empty string if not found; 4. Extract the content of the specified range through substr(). For complex scenarios such as multi-match or nested tags, the regular expression preg_match() or preg_m can be considered
    PHP Tutorial . Backend Development 171 2025-07-13 02:20:30
  • Managing overflow content with css overflow property
    Managing overflow content with css overflow property
    When the content exceeds the container, it is necessary to use the overflow attribute of the CSS. Common scenarios include too long pop-up windows, truncated card information, and displaying some content in fixed height areas. How to use: 1. overflow: visible default overflow displays external; 2. overflow:hidden hides overflow content; 3. overflow:scroll always displays scroll bars; 4. Overflow:auto automatically displays scroll bars when it exceeds. Implementing the ellipsis effect requires other attributes: use white-space:nowrap and text-overflow:ellipsis to achieve single line omission, and use -webkit-line-clam to omit multiple line omissions
    CSS Tutorial . Web Front-end 517 2025-07-13 02:18:20
  • Explain the use cases for php Closures and Anonymous Functions.
    Explain the use cases for php Closures and Anonymous Functions.
    ClosuresandanonymousfunctionsinPHPareusefulforwritingcleaner,moreexpressivecode.1.Theyserveascallbacksinarrayfunctionslikearray_mapandarray_filter,allowinginlinelogicwithoutdefiningseparatefunctions.2.Theyenabledelayedexecutionandencapsulation,mainta
    PHP Tutorial . Backend Development 135 2025-07-13 02:17:00
  • Securing MySQL installations with SSL/TLS connections
    Securing MySQL installations with SSL/TLS connections
    To configure MySQL's SSL/TLS encrypted connection, first generate a self-signed certificate and correctly configure the server and client settings. 1. Use OpenSSL to generate CA private key, CA certificate, server private key and certificate request, and sign the server certificate yourself; 2. Place the generated certificate file in the specified directory, and configure the ssl-ca, ssl-cert and ssl-key parameters in my.cnf or mysqld.cnf and restart MySQL; 3. Force SSL on the client, restrict users from connecting only through SSL through the GRANTUSAGE command, or specify the --ssl-mode=REQUIRED parameter when connecting; 4. After logging in, execute \s to check SSL status confirmation
    Mysql Tutorial . Database 787 2025-07-13 02:16:02
  • How to replace a part of a string in PHP
    How to replace a part of a string in PHP
    There are three common ways to replace some content in a PHP string. 1. Use str_replace for basic replacement, suitable for replacing fixed strings, supporting case sensitivity or ignoring; 2. Use substr_replace to replace content at specified locations, and control the replacement range through index and length; 3. Use regular expressions to replace preg_replace, suitable for replacing content with specific patterns, powerful functions but attention to syntax accuracy is required.
    PHP Tutorial . Backend Development 123 2025-07-13 02:14:31
  • mysql show all tables in database
    mysql show all tables in database
    There are three common ways to view all tables under a database in MySQL. 1. Use USEdatabase_name; execute SHOWTABLES after switching the database; list all tables in the current database; 2. When not switching the database, execute SHOWTABLESFROMdatabase_name; view the tables of the specified database; 3. Query INFORMATION_SCHEMA.TABLES to obtain more detailed table information, such as types and engines, you need to use SELECTtable_name, table_type, engineFROMinformation_schema.tablesWHEREtable_
    Mysql Tutorial . Database 179 2025-07-13 02:13:50
  • PHP prepared statement error handling
    PHP prepared statement error handling
    Error handling is crucial in PHP preprocessing statements because it can improve program robustness and speed up troubleshooting. 1. Importance of error handling: Although preprocessing prevents SQL injection, execution failure may still occur due to SQL syntax errors, field name spelling errors or connection interruptions. If unprocessed, it will be difficult to locate the problem. 2. PDO error handling: It is recommended to set PDO::ERRMODE_EXCEPTION to capture PDOException through try/catch and log logs to avoid exposing the original error information. 3.mysqli error checking: You need to manually check whether each step is successful, and call $stmt->error or mysqli_error() to get the error details. 4
    PHP Tutorial . Backend Development 974 2025-07-13 02:11:51
  • Explain the benefits of using a php framework like Laravel or Symfony (conceptually).
    Explain the benefits of using a php framework like Laravel or Symfony (conceptually).
    The benefits of using PHP frameworks are to simplify repetitive work, improve development efficiency and enhance code maintainability. 1. The routing management is clearer, without manual URL judgment; 2. The ORM simplifies database operations and avoids duplicate SQL statements; 3. Built-in form verification and security mechanisms, such as CSRF and XSS protection; 4. Force and standardize the code structure to facilitate multi-person collaboration and subsequent maintenance; 5. Provide a unified security solution to reduce vulnerability risks; 6. Strong community support makes it easier to find answers to questions. Framework helps developers focus on core functions. Laravel is suitable for rapid development, and Symfony is more suitable for large-scale projects. Overall, using frameworks can significantly improve development efficiency and quality.
    PHP Tutorial . Backend Development 196 2025-07-13 02:11:00
  • Working with spatial data types and functions in MySQL
    Working with spatial data types and functions in MySQL
    MySQL supports spatial data types such as GEOMETRY, POINT, LINESTRING, POLYGON, etc., which can be inserted in WKT format; to create tables with spatial indexes, use SPATIALINDEX and specify engines such as InnoDB; common functions include ST_AsText, ST_GeomFromText, ST_Distance, ST_Contains, etc.; optimization suggestions include adding spatial indexes, avoiding full table scanning, using range filtering, maintaining SRID consistency and combining accurate distance algorithms.
    Mysql Tutorial . Database 324 2025-07-13 02:10:01
  • PHP header location not working after include
    PHP header location not working after include
    When encountering the problem that header('Location:...') does not work, the common reasons and solutions are as follows: 1. There is output in advance, causing the header to fail. The solution is to ensure that there is no output before the jump, including spaces, HTML or echo; 2. There is excess output or UTF-8 BOM characters in the include or require file. The file encoding should be checked and saved as "UTF-8 BOM-free"; 3. It is recommended to use ob_start() to turn on the output buffer before the jump, and cooperate with ob_end_flush() to delay the output; 4. After the jump, be sure to add exit to prevent subsequent code execution; 5. Make sure that the header() function call is before all outputs.
    PHP Tutorial . Backend Development 139 2025-07-13 02:08:51
  • How does PHP handle Database Connections, specifically PDO?
    How does PHP handle Database Connections, specifically PDO?
    PHPhandlesdatabaseconnectionssecurelyandflexiblyusingPDOthroughseveralkeysteps.1.AconnectionisestablishedwithaDSN,username,andpasswordwrappedinatry-catchblocktohandleexceptions.2.PDO’serrorhandlingisconfiguredusingsetAttribute()tothrowexceptionsandim
    PHP Tutorial . Backend Development 556 2025-07-13 02:06:20

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