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- How to use the CSS ch and ex units?
- The unit of ch is equal to the width of the "0" character in the current font, which is suitable for layout based on the number of characters, such as setting the width of the input box to 10ch to accommodate about 10 characters; 2.ex unit is equal to the height of the lower case "x" in the current font, and is often used for icon size or up-and-down positioning, such as setting the height width of the icon to 1.2ex to match the visual height of the text; 3. Both rely on actual font rendering and adjust according to changes in font-family, which is suitable for improving readability and layout accuracy, but attention should be paid to the difference in character width in proportional fonts and compatibility issues of old browsers. Finally, it is recommended to use it reasonably in text-intensive designs to enhance responsiveness and consistency.
- CSS Tutorial . Web Front-end 590 2025-08-03 09:42:02
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- Crafting a Robust Log File Parser with PHP's `preg_match_all`
- Use the preg_match_all function to cooperate with regular expressions to efficiently parse PHP log files. 1. First analyze the log format such as Apache's CLF; 2. build a regular pattern with named capture groups to extract IP, methods, paths and other fields; 3. Use preg_match_all to cooperate with the PREG_SET_ORDER flag to parse multi-line logs in batches; 4. Handle edge cases such as missing fields or cross-row logs; 5. Verify and type convert the extracted data, and finally convert the unstructured logs into structured array data for further processing.
- PHP Tutorial . Backend Development 412 2025-08-03 09:20:01
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- Analyzing the Performance Overhead of the $GLOBALS Superglobal
- Theperformanceoverheadof$GLOBALSisminimalinmostcasesbutcanbecomesignificantinhigh-frequencyfunctionsorlong-runningscripts;1.$GLOBALScreatessymboltableandmemoryoverheadbymirroringallglobalvariables;2.Arrayaccessvia$GLOBALS['var']isslowerthandirectvari
- PHP Tutorial . Backend Development 297 2025-08-03 09:16:01
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- Managing MySQL Connection Limits and Timeouts
- To solve the connection limit and timeout problems of MySQL, first, check and adjust the maximum number of connections, view the current max_connections through SHOWVARIABLES and increase the value appropriately in my.cnf; second, set the wait_timeout and interactive_timeout parameters reasonably to extend the survival time of idle connections; third, optimize the connection behavior of the application side, use the connection pool, release the connection in time, and avoid zombie connections; finally, ensure that the system-level file descriptor limits meet MySQL connection requirements, modify limits.conf and confirm that they take effect.
- Mysql Tutorial . Database 359 2025-08-03 09:11:01
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- How to handle multi-row subqueries in MySQL?
- To handle multi-line subqueries in MySQL, operators that support set comparisons must be used, because =,>,
- Mysql Tutorial . Database 457 2025-08-03 09:09:02
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- How to create a CSS-only slideshow?
- Use hidden radio input and:checked pseudo-class to control slide switching; 2. Related input with slideshow and navigation points through ~ brother selector; 3. Use opacity and transition to achieve fading effect; 4. The navigation label is bound to the input through the for attribute and styled into indicator points; 5. The optional automatic playback requires complex CSS animation but poor maintenance, and it is recommended to rely on user interaction. This method does not require JavaScript, leverages CSS selectors and form states to achieve lightweight and accessible slideshow functionality, suitable for simple image display scenarios.
- CSS Tutorial . Web Front-end 518 2025-08-03 09:08:01
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- Mastering Complex Sort Logic with `usort` and Custom Callbacks
- Use usort() to solve the multi-condition sorting problem of complex data in PHP. 1. Define the sorting logic through a custom callback function and use the operator to return -1, 0 or 1; 2. When implementing multi-level sorting, first compare the main fields, and if equal, enter the secondary fields step by step; 3. Create dynamic callback functions to flexibly adjust the sorting fields and directions according to the configuration array; 4. Support complex types such as date and calculated values, but preprocessing and time-consuming operations are required to improve performance; 5. If the original key name is required, uasort() should be used instead of usort(); finally, efficient and maintainable intelligent sorting is achieved through structured callbacks, and the end is complete.
- PHP Tutorial . Backend Development 790 2025-08-03 09:07:01
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- How to upgrade a MySQL server to a newer version?
- CheckcompatibilitywithOS,applications,andfeatures;2.Backupalldata,configs,andlogs;3.Chooseupgrademethod(packagemanager,MySQLInstaller,ormanual);4.Runpost-upgradechecksandtests;5.Resolveissueslikeauthenticationpluginsordeprecatedoptions.Alwaysbackup,t
- Mysql Tutorial . Database 403 2025-08-03 09:04:01
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- What is the difference between a primary key and a unique key in MySQL?
- AprimarykeycannotcontainNULLvalues,whileauniquekeyallowsoneNULLpercolumn;2.Atablecanhaveonlyoneprimarykeybutmultipleuniquekeys;3.Bothcreateuniqueindexes,buttheprimarykeycreatesaclusteredindex(inInnoDB),whereasuniquekeyscreatenon-clusteredindexes;4.Pr
- Mysql Tutorial . Database 682 2025-08-03 09:03:01
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- How to define an abbreviation or acronym with the tag in HTML
- Use tags in HTML to define abbreviations or acronyms, 1. Wrap abbreviations with tags; 2. Use title attributes to provide full extensions; 3. Enhance visual cues through CSS; 4. Ensure that title attributes are included for accessibility; 5. Applicable to all abbreviations and acronyms, which ensures that content is more friendly to screen readers and users and is semantic.
- HTML Tutorial . Web Front-end 833 2025-08-03 08:59:02
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- How to Clone a MySQL Database for Development or Testing?
- Use mysqldump to export the source database: generate a SQL backup file containing structure and data through the mysqldump command. It is recommended to use parameters such as --single-transaction, --routines, --triggers and --events to ensure consistency and include all objects; 2. Create a new database: If you need to change the database name, create the target database manually, such as CREATEDATABASEdev_db; 3. Import to the target database: If the dump file contains CREATEDATABASE statement, you can import it directly, otherwise you need to modify the dump file or specify the database to import through the command; 4. Development environment data processing: gram
- Mysql Tutorial . Database 641 2025-08-03 08:47:01
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- How to use the HTML style attribute for inline CSS
- Use the style attribute to apply inline CSS directly on HTML elements, which is suitable for quick style settings or dynamic overwriting styles, but for easy maintenance, it is usually recommended to place CSS in external files or tags. 1. Basic syntax: add style attributes to elements, write CSS declarations in the form of property:value, and multiple declarations are separated by semicolons without braces; 2. Common use cases include setting text color, background color, font, spacing and layout, etc.; 3. The usage scenario is single-shot, JavaScript dynamic generation or temporary overwriting style; 4. Avoid using multiple elements, large projects, or when you need to separate structure and presentation; 5. Inline styles have high priority and will overwrite external style rules; 6. Use skills packages
- HTML Tutorial . Web Front-end 416 2025-08-03 08:25:02
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- How to load data from an XML file into a MySQL table?
- Use MySQL's LOADXML statement (only applicable to version 8.0 or below) to directly import the correct format XML file, requiring the file structure to be... and the field name matches the table column; 2. It is recommended to use Python scripts to parse XML and insert data, and implement it through xml.etree.ElementTree and mysql-connector-python, compatible with all MySQL versions and support complex structure processing; 3. In PHP environment, XML can be loaded using SimpleXML and inserted line by line through PDO; 4. XML can be converted into CSV files first, and then imported with LOADDATAINFILE to improve efficiency; MySQL should be considered when selecting methods.
- Mysql Tutorial . Database 694 2025-08-03 08:03:01
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- Understanding MySQL Enterprise Firewall
- MySQLEnterpriseFirewall is an application-layer whitelisting mechanism used in MySQL Enterprise Edition to enhance database security. It supports three modes and is managed through the SQL interface. 1. It filters SQL queries through predefined rules to prevent attacks such as SQL injection, and is only available for enterprise version. 2. Configuration includes enabling plug-ins, creating rule groups, and loading rules. Pay attention to regular syntax and rule conflicts. 3. Common application scenarios include preventing SQL injection, controlling third-party access and audit monitoring. It is recommended to use it in combination with other security measures. 4. When using it, you need to pay attention to performance impact, ORM tool compatibility and rule update frequency, and master the skills of viewing rules and log control. Rational configuration can improve safety, but it needs to be flexibly used to adapt
- Mysql Tutorial . Database 920 2025-08-03 07:56:01
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