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  • Where are PHP sessions stored?
    Where are PHP sessions stored?
    PHPsessionsarestoredontheserverasfilesinadirectoryspecifiedbythesession.save_pathsetting.1.Bydefault,theyarestoredinatemporarydirectorylike/tmp.2.Theexactpathcanbecheckedusingphpinfo()orsession_save_path().3.Sessionstoragecanbecustomizedbychangingses
    PHP Tutorial . Backend Development 907 2025-07-15 02:48:51
  • Why We Comment: A PHP Guide
    Why We Comment: A PHP Guide
    PHPhasthreecommentstyles://,#forsingle-lineand/.../formulti-line.Usecommentstoexplainwhycodeexists,notwhatitdoes.MarkTODO/FIXMEitemsanddisablecodetemporarilyduringdebugging.Avoidover-commentingsimplelogic.Writeconcise,grammaticallycorrectcommentsandu
    PHP Tutorial . Backend Development 628 2025-07-15 02:48:00
  • How to Install PHP on Windows
    How to Install PHP on Windows
    The key steps to install PHP on Windows include: 1. Download the appropriate PHP version and decompress it. It is recommended to use ThreadSafe version with Apache or NonThreadSafe version with Nginx; 2. Configure the php.ini file and rename php.ini-development or php.ini-production to php.ini; 3. Add the PHP path to the system environment variable Path for command line use; 4. Test whether PHP is installed successfully, execute php-v through the command line and run the built-in server to test the parsing capabilities; 5. If you use Apache, you need to configure P in httpd.conf
    PHP Tutorial . Backend Development 732 2025-07-15 02:46:40
  • PHP Syntax: The Basics
    PHP Syntax: The Basics
    The basic syntax of PHP includes four key points: 1. The PHP tag must be ended, and the use of complete tags is recommended; 2. Echo and print are commonly used for output content, among which echo supports multiple parameters and is more efficient; 3. The annotation methods include //, # and //, to improve code readability; 4. Each statement must end with a semicolon, and spaces and line breaks do not affect execution but affect readability. Mastering these basic rules can help write clear and stable PHP code.
    PHP Tutorial . Backend Development 430 2025-07-15 02:46:20
  • Easy PHP Setup with XAMPP
    Easy PHP Setup with XAMPP
    XAMPP is suitable for beginners or need to quickly build a local PHP environment; it integrates Apache, MySQL, PHP and phpMyAdmin, and is ready for use out of the box; after downloading the corresponding system installation package, install and select necessary components by default; start the Apache and MySQL services in the control panel, modify the port to resolve the conflict problem of port 80; put the PHP file into the htdocs directory and run it, access the test results through the browser, and manage the database through phpMyAdmin.
    PHP Tutorial . Backend Development 777 2025-07-15 02:45:41
  • How to handle HTML parsing errors?
    How to handle HTML parsing errors?
    To handle HTML parsing errors, you need to check the tag structure, use the parsing library, handle encoding issues, and pay attention to JS rendering content. 1. Check whether the HTML tag is correctly closed and nested. It is recommended to use W3CMarkupValidationService verification; 2. Use parsing libraries such as BeautifulSoup, lxml, and cheatio to improve fault tolerance; 3. Ensure that the correct character set is declared and special characters are escaped, and the appropriate encoding is set in the program; 4. Distinguish between static HTML and dynamic rendering content, and use a headless browser to crawl the complete page if necessary.
    HTML Tutorial . Web Front-end 617 2025-07-15 02:43:02
  • mysqldump single table with where clause
    mysqldump single table with where clause
    The method of using mysqldump to export a single table and add WHERE conditions is as follows: 1. Use the --where parameter to specify the filter conditions, and the syntax is mysqldump-u[username]-p[database_name][table_name]-where="condition">output_file.sql; 2. Note that fields and values need to be quoted correctly, especially when containing spaces or special characters; 3. The default export includes table creation statements, if only data is required, the -t parameter can be added; 4. It is not supported to add different conditions to multiple tables at a time, and it needs to be executed separately. This method is suitable for data backup, migration or retrieval
    Mysql Tutorial . Database 727 2025-07-15 02:42:20
  • How to style the default marker of a element?
    How to style the default marker of a element?
    To hide and customize the default marker for elements, first use CSS to hide native markers: use summary::-webkit-details-marker{display:none;} for WebKit browsers, and summary{list-style:none;} for Firefox. Then customize the marker style through pseudo-elements, such as adding the "?" character with summary::after, and setting the position, transition and rotation effects. Finally, pay attention to compatibility and accessibility issues to ensure that they perform consistently in different browsers without affecting the user experience.
    HTML Tutorial . Web Front-end 644 2025-07-15 02:41:22
  • mysql incorrect string value for column
    mysql incorrect string value for column
    MySQL error "incorrectstringvalueforcolumn" is usually because the field character set does not support four-byte characters such as emoji. 1. Cause of error: MySQL's utf8 character set only supports three-byte characters and cannot store four-byte emoji; 2. Solution: Change the database, table, fields and connections to utf8mb4 character set; 3. Also check whether the configuration files, temporary tables, application layer encoding and client drivers all support utf8mb4; 4. Alternative solution: If you do not need to support four-byte characters, you can filter special characters such as emoji at the application layer.
    Mysql Tutorial . Database 672 2025-07-15 02:40:01
  • Working with Strings in PHP
    Working with Strings in PHP
    PHP often uses dot styling, sprintf formatting, strpos search, str_replace replacement, trim cleaning, htmlspecialchars anti-XSS, and urlencode encoding. 1. Use . or sprintf() for splicing; 2. Use strpos() for search, and replace str_replace() for str_replace(); 3. Use trim(), strip_tags(), and htmlspecialchars() for cleaning; 4. Use mb_convert_encoding() for encoding and conversion, and use urlencode()/urldecode() for URL encoding and decoding.
    PHP Tutorial . Backend Development 816 2025-07-15 02:38:40
  • Describe the Null Coalescing Operator (`??`) in PHP
    Describe the Null Coalescing Operator (`??`) in PHP
    PHP's null merge operator (??) is used to check whether a variable or array element exists and is not null. If it exists and has a value, it returns the value, otherwise it returns the specified default value. 1. It solves the problem of providing fallback values when undefined variables or null values, which is more concise and accurate than ternary operators (?:) and isset(); 2. Unlike ?:, ?? only triggers fallback when the value is null, and ?: will also trigger when the value is false (such as empty strings, 0, false); 3. It is often used to deal with default values for hyperglobal variables, optional array keys, class attributes or function parameters; 4. Support chain calls to try multiple options; 5. Note: Accessing undefined variables will still trigger notice, and you need to ensure that the parent variable exists.
    PHP Tutorial . Backend Development 707 2025-07-15 02:37:40
  • What is the reversed attribute on an ordered list?
    What is the reversed attribute on an ordered list?
    The Thereversed property is used to make ordered list() appear in reverse order, and its working principle is to automatically descend to number according to the number of list items. 1. The browser first counts the number of elements; 2. Then count down the number from this number; 3. Supports manual setting of the starting value and using it in combination with the start attribute; 4. Only affects the visual display but does not affect HTML structure and accessibility; 5. Commonly used in countdown, legal documents, comment sections and other scenarios; 6. Modern browsers generally support it, but IE11 and below versions are incompatible, so JavaScript is required.
    HTML Tutorial . Web Front-end 164 2025-07-15 02:37:02
  • How to add a caption to an image using the HTML and tags?
    How to add a caption to an image using the HTML and tags?
    The standard way to add image titles in HTML is to use and tags. 1. Use these two labels to realize the semantic structure, wrap the picture with the explanatory text, so that the title is displayed below the picture by default; 2. The title position, font size or superimpose it on top of the picture through CSS style; 3. If the semantic structure is not emphasized, the layout can also be used or manually controlled to provide greater flexibility. No matter which method you choose, you can flexibly set the title style according to project needs.
    HTML Tutorial . Web Front-end 443 2025-07-15 02:36:42
  • What are HTML accessibility best practices
    What are HTML accessibility best practices
    The key to improving the overall user experience of web accessibility is to follow HTML best practices. 1. Use semantic tags such as, , etc. to replace meaningless sums to help screen readers identify structures and improve SEO and maintenance efficiency; 2. Add meaningful alt text to the picture or set to empty alt="" to ensure that information is communicated and does not affect accessibility browsing; 3. Ensure that keyboard navigation is available, smooth access to all interactive elements through the Tab key, and provide clear focus feedback; 4. The form needs to be bound to labels, and use ARIA attributes to prompt errors to avoid relying on colors to transmit information only. These details are small but are crucial for barrier-free experiences.
    HTML Tutorial . Web Front-end 405 2025-07-15 02:36:22

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