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  • php get day name from date
    php get day name from date
    Getting the day of the week corresponding to a date in PHP can be achieved by using functions such as date() and strftime(). 1. Use the date() or strftime() function to get the week name directly from the timestamp, such as date('l',$timestamp) returns the full week name, date('D',$timestamp) returns the abbreviation, and strftime('%A',$timestamp) returns the localized week name according to the system locale settings. 2. The Chinese week name can be used through setlocale (LC_TIME,'zh_CN.UTF-8') and then used with strftime(), or
    PHP Tutorial . Backend Development 491 2025-07-09 01:05:10
  • Explain the Difference Between `==` and `===` Operators in PHP
    Explain the Difference Between `==` and `===` Operators in PHP
    In PHP, the main difference between == and == is the strictness of type checking. The == operator performs type conversion when comparing, while === strictly checks the values ??and types without conversion. For example: "5"==5 returns true but "5"==5 returns false; 0==false is true but 0===false is false; null===0 is always false. You should use == when the type is independent or requires flexible comparison, such as user input processing; if the type must be consistent, such as the detection function returns false, validation null or boolean flag. It is recommended to use === first to avoid logic caused by type conversion
    PHP Tutorial . Backend Development 201 2025-07-09 01:03:01
  • how to enable binary logging in mysql
    how to enable binary logging in mysql
    To enable MySQL's binary log, you first need to add settings in the configuration file. The specific steps are: 1. Add server-id=1 and log-bin=mysql-bin in the [mysqld] paragraph to enable logs and specify file name prefix; 2. Optionally configure log path and retention policy, such as expire_logs_days=7 to automatically clean logs seven days ago; 3. After modification, restart MySQL service and verify the enabled status through SHOWVARIABLESLIKE'log_bin' and SHOWBINARYLOGS; 4. If you need to clean the logs manually, you can use the PURGEBINARYLOGS command to delete the specific file or before the time.
    Mysql Tutorial . Database 267 2025-07-09 01:01:00
  • Monitoring MySQL Server Performance and Status
    Monitoring MySQL Server Performance and Status
    To monitor the performance and status of MySQL server, you need to start from four aspects: built-in commands, resource monitoring, tool usage and log checking. 1. Use built-in commands such as SHOWSTATUS and SHOWPROCESSLIST to quickly view the number of connections and running status; 2. Use system commands and MySQL internal mechanisms to monitor the execution efficiency of CPU, memory, disk IO and SQL; 3. Use MySQLWorkbench, Prometheus Grafana, Zabbix or PMM to achieve continuous monitoring and reasonably set the acquisition frequency; 4. Regularly analyze error logs and slow query logs, set thresholds and optimize SQL that is not indexed, so as to promptly discover potential problems and prevent service interruptions.
    Mysql Tutorial . Database 384 2025-07-09 01:00:11
  • How to make an HTML responsive?
    How to make an HTML responsive?
    The key to achieving a built-in responsive layout is to avoid fixed widths and utilize container scale. The easiest way is to set the iframe width to 100% and use the aspect-ratio attribute to control the aspect ratio, such as iframe{width:100%; aspect-ratio:16/9;}, which is suitable for modern browsers and video embedding scenarios; if IE compatible, you can use the outer div container to match the padding-top technique to achieve responsiveness by setting .iframe-container{position:relative;width:100%;padding-top:56.25%;} and absolute positioning of iframes;
    HTML Tutorial . Web Front-end 172 2025-07-09 00:57:41
  • How to embed a PDF document in an HTML page?
    How to embed a PDF document in an HTML page?
    To embed PDF files in web pages, the most common method is to use HTML or tags, or to use third-party services such as GoogleDocs to achieve more friendly display. 1. Use tags to quickly and directly embed PDFs. The syntax is the advantage of simple writing and good compatibility, but limited style control; 2. Use tags to provide more custom space and add alternate content. The syntax is that your browser does not support PDF preview. Please download this file. The advantage is that it provides download links to improve user experience when it does not support PDF display; 3. With the help of GoogleDocs, online viewers can be realized through iframes. The syntax is that you need to pay attention to URL encoding and network access rights issues. It is recommended for mobile adaptation, and supports zooming and page turning operations. also
    HTML Tutorial . Web Front-end 163 2025-07-09 00:55:01
  • how to get current quarter from date in mysql
    how to get current quarter from date in mysql
    The function to get the quarter where the date is in MySQL is QUARTER(). Use QUARTER(date) to directly return quarterly values ??between 1 and 4; you can also use CURDATE() to obtain the current quarter; if you need to be compatible with other databases or manually calculate, you can extract the month by MONTH(date) and calculate the quarter through formula (month 2) DIV3.
    Mysql Tutorial . Database 112 2025-07-09 00:50:51
  • when should i create an index in mysql
    when should i create an index in mysql
    The timing of creating an index includes: 1. Query frequently uses a certain field as a filtering condition, especially when it can significantly reduce the result set, it is suitable to add single columns or composite indexes, but avoid fields with low distinction; 2. Fields that are often used for JOIN operations should be indexed, and the index order should be consistent with the JOIN order; 3. Indexes can be used to avoid additional sorting, pay attention to index direction and order matching; 4. Overwriting indexes are suitable for scenes where all fields are included in the index, reducing back-to-table query, and improving reading efficiency.
    Mysql Tutorial . Database 812 2025-07-09 00:48:51
  • Updating Existing Records in a MySQL Table with Specific Conditions
    Updating Existing Records in a MySQL Table with Specific Conditions
    The key to safely and efficiently updating records in MySQL is to use WHERE conditions and reasonable structures accurately. 1. Use the WHERE clause to limit the update scope to ensure accurate conditions. Use SELECT to check the matching data before update; 2. During batch updates, you can use the CASEWHEN structure to achieve differentiated updates of multiple records to improve efficiency; 3. Pay attention to performance issues, such as adding indexes, avoiding full table scanning, using LIKE and functions with caution, and it is recommended that the test environment be verified first.
    Mysql Tutorial . Database 192 2025-07-09 00:46:21
  • mysql find and replace in string
    mysql find and replace in string
    In MySQL, the REPLACE() function can replace the string in the field. The syntax is UPDATE table name SET field name =REPLACE (field name, 'old content', 'new content'); 1. This operation is replaced globally and case-sensitive; 2. It is recommended to backup or add WHERE conditional test before execution; 3. The replacement effect can be previewed in SELECT; 4. Pay attention to avoiding error substitution, performance impact and data backup problems.
    Mysql Tutorial . Database 813 2025-07-09 00:44:20
  • Using flexbox for complex css layouts
    Using flexbox for complex css layouts
    To use flexbox to implement a responsive navigation bar, first set .navbar as a flex container, and use justify-content:space-between to achieve spindle alignment; secondly add flex-wrap:wrap to allow navigation items to automatically wrap when there is insufficient space; finally control the spacing between items through the gap attribute. In addition, when building a card layout, 1. Set the parent container to display:flex; 2. Use flex-basis to control the width of the child item, such as the three-column layout can be calc (33.33%-gap); 3. Dynamically adjust flex-basis to adapt to different screens in combination with media queries. Note when using nested flex containers
    CSS Tutorial . Web Front-end 113 2025-07-09 00:43:30
  • how to connect a php framework to a mysql database
    how to connect a php framework to a mysql database
    ToconnectaPHPframeworktoMySQL,firstsetupthedatabasewithtoolslikephpMyAdminorthecommandlinebycreatingadatabaseanduserwithproperprivileges.Next,updatetheframework’sconfigurationfile—like.envinLaravel,database.phpinCodeIgniter,ordoctrine.yamlinSymfony—w
    PHP Tutorial . Backend Development 762 2025-07-09 00:42:21
  • How to call a namespaced function in PHP?
    How to call a namespaced function in PHP?
    There are three ways to call namespace functions in PHP: using fully qualified names, importing through use statements, or calling directly within the same namespace. 1. When using a fully qualified name, you need to add a backslash before the namespace, such as \Utilities\Text\format("hello"); 2. After importing through usefunctionUtilities\Text\format; you can directly call format("world"), or you can use alias such as usefunctionUtilities\Text\formatText; to call formatTe
    PHP Tutorial . Backend Development 767 2025-07-09 00:40:01
  • PHP strcmp vs == for string comparison
    PHP strcmp vs == for string comparison
    To compare PHP strings, you should choose different methods according to your needs, and you cannot blindly use ==. Strictly compare it with ===, and strcmp() is used for dictionary order comparison. 1.==Unreliable, type conversion will cause unexpected results, such as '0e123'=='0' is true; 2.=== is the safest comparison method, the judgment is completely consistent and the type is not converted; 3.strcmp() is used to compare strings in dictionary order, returning -1, 0, and 1 to represent size relationships, and is case sensitive; 4. Safe scenarios must avoid ==, and performance === is better. Pay special attention to traps when comparing null or boolean values.
    PHP Tutorial . Backend Development 593 2025-07-09 00:38:32

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