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  • How to parse a URL query string into variables with parse_str
    How to parse a URL query string into variables with parse_str
    ToextractvariablesfromaURLquerystringinPHP,usetheparse_str()function.1.Passthequerystringandanoutputarraytoconvertparametersintoanassociativearray.2.ForfullURLs,firstextractthequerypartusingparse_url().3.Alwaysprovideasecondargumenttoavoidvariableinj
    PHP Tutorial . Backend Development 714 2025-07-09 00:35:40
  • What is the oninput event and how is it different from onchange?
    What is the oninput event and how is it different from onchange?
    Oninput triggers real-time feedback when user inputs, and onchange triggers when the value changes after losing focus. oninput is used for real-time verification, search and filtering, and other scenarios that require immediate response, while onchange is suitable for scenarios that pay attention to the final value, such as saving settings or submitting data; performance issues should be paid attention to when using oninput, and can be optimized through anti-shake and other methods.
    HTML Tutorial . Web Front-end 915 2025-07-09 00:30:42
  • Adding Developer Comments to HTML Source Code
    Adding Developer Comments to HTML Source Code
    Adding comments to HTML can improve code readability and teamwork efficiency. Because HTML is a structured markup language and lacks obvious logical processes, it is difficult to understand the role of blocks when the page is complex. At this time, the comments can be used as "navigation" to answer questions such as module purpose, dynamic content source, form behavior, etc. Effective comments should be clear and concise, and use syntax. Common methods include explaining the purpose of the module (such as), marking precautions or to-do items (such as), marking code segment boundaries, and avoiding redundant explanations. Scenes suitable for annotation include page structure partitions, complex nesting areas, elements that require special processing and template reference locations. The unified annotation style is better when collaborating with teams, such as whether to use abbreviations, alignment, specific keywords, etc., which will help maintain and understand for a long time.
    HTML Tutorial . Web Front-end 389 2025-07-09 00:29:12
  • php array remove duplicates from multidimensional array
    php array remove duplicates from multidimensional array
    When dealing with PHP multi-dimensional array deduplication, you cannot use array_unique directly, and other methods are required. 1. Use serialize and unserialize to combine array_map to serialize the sub-array into a string and then deduplicate it, and then restore it to an array, which is suitable for two-dimensional arrays; 2. Customize the comparison function arrayUnique, which manually compares each element through traversal, which is highly flexible but less efficient; 3. Pay attention to the fact that the key names and order will affect the uniqueness judgment, and it is recommended to unify the structure or compare according to specific fields; 4. If deduplicate it according to a certain field (such as id), you can use a temporary array to record the existing field values, and only the items that appear for the first time are retained. The selection method should be determined based on the data structure and performance requirements.
    PHP Tutorial . Backend Development 955 2025-07-09 00:28:11
  • How to check if a PHP session is active?
    How to check if a PHP session is active?
    TocheckifaPHPsessionisactive,usesession_status()whichreturnsPHP_SESSION_ACTIVEifasessionisrunning.1.Usesession_status()===PHP_SESSION_ACTIVEforreliabledetection.2.Avoidrelyingonisset($_SESSION)asitcanbemisleading.3.ForlegacyPHPversionsbefore5.4,usese
    PHP Tutorial . Backend Development 834 2025-07-09 00:26:31
  • how to get last inserted id in mysql
    how to get last inserted id in mysql
    The core method for getting the last inserted ID in MySQL is to use the LAST_INSERT_ID() function, which returns the autoincrement ID generated by the last insertion in the current connection. 1. Get the ID directly after insertion: call LAST_INSERT_ID() immediately after executing the INSERT statement, which is suitable for tables with auto-incremental primary keys; 2. Used in programming languages: For example, PDO extension of PHP calls the function through lastInsertId() and Python's mysql-connector through lastrowid package; 3. Performance when inserting multiple lines: Return the ID of the first insert record, not the last; 4. Notes include: Connection isolation ensures that it is not affected.
    Mysql Tutorial . Database 604 2025-07-09 00:23:40
  • How to escape a string for a database query in PHP
    How to escape a string for a database query in PHP
    The most direct and effective way to prevent SQL injection is to use parameterized queries. 1. Use PDO preprocessing statements to safely bind variables by naming placeholders and execute() methods; 2. Use mysqli's preprocessing function to bind parameters through the placeholders and bind_param() methods; 3. Manual escape strings are not recommended because there are security risks and are outdated; 4. Always verify and filter user input, combined with the built-in security mechanism of the framework to enhance security.
    PHP Tutorial . Backend Development 491 2025-07-09 00:22:21
  • PHP prepared statement for DELETE query
    PHP prepared statement for DELETE query
    Performing DELETE operations using PHP's preprocessing statements prevents SQL injection and ensures that deletion is safe and controllable. 1. Establish a reliable database connection. It is recommended to use MySQLi or PDO; 2. Use placeholders (?) to write DELETE preprocessing statements and bind parameters through bind_param to ensure type matching; 3. Call execute() to perform deletion operations; 4. Optionally check affected_rows to confirm whether the deletion takes effect; 5. Pay attention to calling execute() multiple times during batch deletion, and explicitly close the statement to standardize the operation process.
    PHP Tutorial . Backend Development 991 2025-07-09 00:19:41
  • Implementing CSS Flexbox item wrapping
    Implementing CSS Flexbox item wrapping
    To make the items in the Flexbox layout automatically wrap, you need to set flex-wrap:wrap; 1. Use the flex-wrap attribute to control whether to wrap the line. Common values ??include nowrap (not wrapping), wrap (down wrapping) and wrap-reverse (up wrapping); 2. Combining the flex-direction attribute can change the direction of the spindle, affecting the arrangement order and line breaking position, such as row (default from left to right), row-reverse (from right to left), column (from top to bottom), etc.; 3. After wrapping, it is recommended to use the gap attribute to set the project spacing uniformly to improve the layout neatness, but pay attention to browser compatibility. Master these techniques to easily achieve responsive fabrics
    CSS Tutorial . Web Front-end 962 2025-07-09 00:19:20
  • How to make an HTML page responsive
    How to make an HTML page responsive
    The key to making responsive HTML pages is to combine CSS and media queries to automatically adapt to different screen sizes. 1. Use viewport meta tags to control mobile display: 2. Set breakpoints through media queries, such as mobile phone max-width:480px, tablet 481px-768px, desktop 769px or above; 3. Use Flexbox or Grid to achieve elastic layout; 4. Use max-width:100% to prevent overflow of containers; 5. Use mobile-first strategy to write basic styles for small screens first and then gradually enhance them. These steps can effectively improve page adaptability and avoid common problems.
    HTML Tutorial . Web Front-end 119 2025-07-09 00:17:52
  • 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 268 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 715 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 509 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 550 2025-07-09 00:14:00

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