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  • How to handle Date and Time operations in PHP?
    How to handle Date and Time operations in PHP?
    It is recommended to use the DateTime class for PHP processing date and time. 1. Use the DateTime class to replace old functions, with clear structure and support time zone settings; 2. Use DateTime to manage time and specify the target time zone before output; 3. Use DateInterval to calculate the time difference and obtain complete information such as year, month, and day; 4. Pay attention to avoid the influence of mixed use of date() functions, hard-coded time strings and daylight saving time.
    PHP Tutorial . Backend Development 273 2025-07-09 00:17:31
  • Creating dropdown menus with pure css
    Creating dropdown menus with pure css
    The key to making a pure CSS drop-down menu is that it has clear structure, natural interaction, and no JavaScript is required. 1. Use unordered lists and list items to build a semantic HTML structure. Place the main menu item under .menu, and the submenu is implemented with nesting; 2. Display hidden through CSS's :hover pseudo-class and positioning control. Use display:none; hide submenu by default. Use display:block; to display when hovering, and set position:absolute; to coordinate with parent element position:relative; to coordinate positioning; 3. Optimize the experience and add transition animations, such as opacity and visibility combined with transition implementation.
    CSS Tutorial . Web Front-end 717 2025-07-09 00:16:01
  • How to make a phone number clickable in HTML?
    How to make a phone number clickable in HTML?
    In web development, using HTML tags and tel: protocol can realize the function of clicking and making calls. The specific method is to create links through format and it is recommended to keep the number concise or add country codes to support international numbers, such as tel: 11234567890. At the same time, the control phone link can be checked through CSS media to display only on the mobile terminal, improving the responsive design experience.
    HTML Tutorial . Web Front-end 514 2025-07-09 00:15:31
  • PHP header location with variables not working
    PHP header location with variables not working
    The main reasons for header jump failure include early output triggering, variable splicing errors and path configuration problems. 1. Output triggers in advance: Check whether there are echo/print/var_dump or file to introduce empty lines, and use ob_start() to buffer the output; 2. Variable splicing errors: Make sure that the variable has values ??and is formatted correctly, encode parameters with urlencode and print the verification URL; 3. Path or server problems: Confirm the path is correct and the domain name protocol matches, check the .htaccess/Nginx rewrite rules, manually test the URL access permissions and add exit termination script.
    PHP Tutorial . Backend Development 554 2025-07-09 00:14:00
  • How to use the CSS :target pseudo-class with HTML anchors?
    How to use the CSS :target pseudo-class with HTML anchors?
    TheCSS:targetpseudo-classallowsstylingofaspecificwebpagesectionwhenitistargetedviaaURLfragment.Whenauserclicksalinklike,thebrowserscrollstotheelementwiththematchingid,and:targetappliesstylesonlytothatactiveelement.Forexample,clicking"JumptoBox&q
    HTML Tutorial . Web Front-end 837 2025-07-09 00:12:52
  • How Do You Secure File Uploads in PHP?
    How Do You Secure File Uploads in PHP?
    TosecurelyhandlefileuploadsinPHP,youmusttreateveryfileasapotentialthreatandimplementmultipleprotectivemeasures.1.LimitfiletypesusingawhitelistandverifytheactualextensionafterrenaminginsteadofrelyingonMIMEtypes.2.Renamefileswithuniqueidentifierstoprev
    PHP Tutorial . Backend Development 415 2025-07-09 00:08:40
  • Configuring SEO and Social Sharing with HTML Meta Tags
    Configuring SEO and Social Sharing with HTML Meta Tags
    To optimize the website's SEO and social media sharing effect, the HTML meta tag should be set correctly. The specific steps are as follows: 1. Set up SEO-related meta tags, including tags containing keywords and no more than 60 characters, labels that attract clicks and control them to about 160 words, and add them to improve the mobile experience; 2. Configure commonly used meta tags on social media sharing, such as og:title, og:description, og:image, og:url and og:type in the OpenGraph protocol, as well as Twitter:card tags for TwitterCard to ensure that appropriate titles, descriptions and pictures are displayed when sharing; 3. Pay attention to debugging
    HTML Tutorial . Web Front-end 884 2025-07-09 00:07:22
  • Structuring Content Using Unordered and Ordered Lists in HTML
    Structuring Content Using Unordered and Ordered Lists in HTML
    Unordered lists are suitable for items without a specific order, and are wrapped with tags, and each entry is represented by; an ordered list is used for content with sequence requirements, and each entry is also represented by tags. 1. Unordered lists use dots as marking symbols by default, and are often used in scenarios such as website navigation menus, article labels or product feature introductions. 2. The ordered list is displayed in sequence through numbering, suitable for operation steps, competition rankings or teaching processes, and the numbering style can be defined through type attributes. 3. Lists can be used in nesting and can be included with each other, but you need to pay attention to issues such as indentation, hierarchy, and semantics to improve readability and SEO effect.
    HTML Tutorial . Web Front-end 915 2025-07-09 00:05:42
  • mysql data types explained
    mysql data types explained
    ChoosingtherightMySQLdatatypeimprovesstorage,performance,andquerybehavior.1.UseINTforgeneralwholenumbers,TINYINTforsmallranges,DECIMALforexactprecision(e.g.,financialdata),FLOAT/DOUBLEforapproximatescientificvalues,andavoidoverusingBIGINT.2.ChooseCHA
    Mysql Tutorial . Database 649 2025-07-09 00:04:50
  • how to loop through php array
    how to loop through php array
    Common methods of traversing arrays by PHP include: 1. Use foreach to handle associative and indexed arrays, suitable for scenarios where indexes are not manually controlled; 2. Use for loops to traverse indexed arrays, suitable for situations where indexes need to be precisely controlled, but attention should be paid to avoid repeated calls to count() and non-continuous indexes; 3. While combined with each() for old versions of PHP traversal, but it has been deprecated in PHP8; 4.array_map is used to execute functions on each element and return a new array; 5.array_walk is used to directly modify the original array or execute side effects. Choosing the appropriate method according to the specific scenario can improve development efficiency and code readability.
    PHP Tutorial . Backend Development 931 2025-07-09 00:02:01
  • Better CSS Shapes Using shape() — Part 4: Close and Move
    Better CSS Shapes Using shape() — Part 4: Close and Move
    The shape() function's close and move commands may not be ones you reach for often, but are incredibly useful for certain shapes.
    CSS Tutorial . Web Front-end 177 2025-07-08 09:51:11
  • Working with JSON data type in MySQL
    Working with JSON data type in MySQL
    MySQL supports JSON data types introduced since version 5.7 to handle structured and semi-structured data. 1. When inserting JSON data, you must use a legal format. You can use JSON_OBJECT or JSON_ARRAY functions to construct, or pass in the correct JSON string; 2. Updates should use JSON_SET, JSON_REPLACE, JSON_REMOVE to modify some fields instead of the entire replacement; 3. Query can extract fields through JSON_CONTAINS, -> operators, and note that the string value needs to be double quoted; 4. It is recommended to create a generated column and index to improve performance when using JSON type.
    Mysql Tutorial . Database 743 2025-07-08 02:57:21
  • Understanding the MySQL optimizer's behavior
    Understanding the MySQL optimizer's behavior
    The MySQL query optimizer selects the optimal execution plan based on statistical information. The core mechanism is a cost-based model (CBO), which estimates I/O and CPU costs to determine the execution path; 1. Perform ANALYZETABLE regularly to ensure the accuracy of statistical information; 2. Indexes are not always used, such as querying large amounts of data or function operations may fail; 3. It is recommended to use EXPLAIN to view the execution plan, create overlay indexes, and avoid implicit type conversion; 4. The optimizer can be booted through USEINDEX or FORCEINDEX, but be cautious; 5. Rewriting the SQL structure and controlling the connection order can also affect the optimization results. Mastering these logic and combining tool analysis can help to optimize efficiently.
    Mysql Tutorial . Database 910 2025-07-08 02:56:01
  • Using JSON Data Type and Functions in MySQL 5.7 and Later
    Using JSON Data Type and Functions in MySQL 5.7 and Later
    MySQL5.7 natively supports JSON data types, improving the efficiency of processing unstructured data. 1. Use the JSON type to automatically verify the data format and provide special function operation content; 2. When querying, field values ??can be extracted through -> or JSON_EXTRACT(), supporting array element extraction; 3. Use functions such as JSON_SET(), JSON_REPLACE(), JSON_REMOVE() to modify data; 4. You can optimize the query performance of JSON fields by generating virtual columns and establishing indexes; 5. Although it is flexible, JSON type should not be abused, and it needs to be used in combination with actual scenarios.
    Mysql Tutorial . Database 312 2025-07-08 02:53:40

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