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  • How to debug a PHP function?
    How to debug a PHP function?
    The key to debugging PHP functions is to master practical methods and tools. 1. First check whether the input parameters are correct, use var_dump or print_r to print parameter values, and confirm whether the type, format and default values ??are reasonable; 2. Turn on error reports (error_reporting and display_errors), display all error messages, and help position variables undefined and keys, etc.; 3. Segmented testing logic, and determine whether the code execution process and intermediate results are in line with expectations through temporary output or logging; 4. Use debugging tools such as Xdebug to cooperate with IDE to achieve breakpoint debugging, single-step execution, etc. to improve efficiency; 5. Maintain good code specifications to reduce naming confusion or unclear function responsibilities
    PHP Tutorial . Backend Development 282 2025-07-10 13:58:01
  • Explain PHP Exception catching and creating custom exceptions.
    Explain PHP Exception catching and creating custom exceptions.
    In PHP development, catch exceptions and customize exception classes to improve code robustness. 1. Use try to wrap error codes, catch catch and handle exceptions, throw manually exceptions; 2. Custom exception classes inherit Exceptions, such as DatabaseException, PermissionException, and targeted processing; 3. Get detailed error information through getMessage(), getCode(), getFile() and other methods for debugging, but the production environment needs to turn off sensitive output.
    PHP Tutorial . Backend Development 758 2025-07-10 13:57:41
  • How to link a CSS file to an HTML file
    How to link a CSS file to an HTML file
    The most direct way to make HTML files use CSS style is to correctly link CSS files. ① To use tags to introduce external CSS files, you need to add them in the HTML part, where the rel attribute must be stylesheet and href points to the correct CSS file path; ② You can also embed inline style sheets by using tags in HTML, which are suitable for simple pages or tests, but are not recommended for multi-page projects; ③ If the style does not take effect, you should check whether the path is correct, whether the browser loads the CSS file, whether there are caching problems, and whether there are conflicts or errors in the CSS writing method.
    HTML Tutorial . Web Front-end 649 2025-07-10 13:57:11
  • How to use the canvas element in HTML?
    How to use the canvas element in HTML?
    How to draw graphics and implement animations in HTML5 Canvas? 1. Insert tags in HTML and set id and size; 2. Get the canvas element through JavaScript and create a 2D drawing context; 3. Use fillRect, strokeRect, arc and other methods to draw shapes; 4. Use fillText to add text and drawImage to draw pictures; 5. Use clearRect to clear the canvas and combine requestAnimationFrame to achieve animation effects. Master these basic operations and start drawing and animation development using Canvas.
    HTML Tutorial . Web Front-end 221 2025-07-10 13:54:41
  • What is the difference between , , and ?
    What is the difference between , , and ?
    Thekeytochoosingbetween,,andliesinunderstandingtheirsemanticroles.1.Useasagenericcontainerwhensemanticsareirrelevant,typicallyforlayoutorstylingpurposes.2.Optforwhengroupingthematicallyrelatedcontent,usuallyintroducedbyaheading,toenhanceaccessibility
    HTML Tutorial . Web Front-end 624 2025-07-10 13:54:11
  • PHP preg_match_all to find all matches in a string
    PHP preg_match_all to find all matches in a string
    ToextractalloccurrencesofapatternfromastringinPHP,usethepreg_match_allfunction;itscansthestringwitharegularexpressionandreturnsallmatchesinanarray.1.Thesyntaxispreg_match_all($pattern,$subject,$matches,$flags,$offset),where$patternistheregexwrappedin
    PHP Tutorial . Backend Development 563 2025-07-10 13:51:31
  • What is a 'pure function' and how to write one in PHP?
    What is a 'pure function' and how to write one in PHP?
    Pure functions are concepts in functional programming. They can be implemented in PHP by following specific rules. The core features include: 1. No side effects, no modification of global variables, object states or performing I/O operations; 2. The same input always returns the same output, and does not rely on external data such as time and random numbers; 3. Keep simple and focused, only process inputs and return results, and do not use reference modifications or static variables to retain state. For example, sum(int$a,int$b):int is a typical pure function that only depends on parameters and has no external influence.
    PHP Tutorial . Backend Development 410 2025-07-10 13:51:10
  • Implementing Drag and Drop Functionality Using HTML APIs
    Implementing Drag and Drop Functionality Using HTML APIs
    The key steps to implement the draggable function include: 1. Use the draggable attribute of HTML5 to make the elements draggable; 2. Set drag data through the dragstart event; 3. Listen to the dragover and drop event processing placement logic in the target area; 4. Use the FileList object to implement drag and drop upload. The HTML5 native drag and drop API uses a series of event control processes, such as dragstart, dragover, drop, etc., where draggable custom elements need to be set to set draggable="true" and bind dragstart event, and call setData() to save data. The dr must be blocked when handling drag and drop
    HTML Tutorial . Web Front-end 377 2025-07-10 13:50:22
  • How to write a media query for high-resolution (Retina) displays?
    How to write a media query for high-resolution (Retina) displays?
    To write practical and reliable media query rules, you must first use min-resolution or -webkit-min-device-pixel-ratio to determine the device resolution, then load high-definition pictures through background image replacement or img's srcset, then optimize the display effect of SVG and icon fonts, and pay attention to adapting to mainstream devices, testing and verification and performance optimization. The specific steps are as follows: 1. Use min-resolution:2dppx or -webkit-min-device-pixel-ratio:2 to detect the Retina screen; 2. Use media query to switch the background image to the HD version or use the srcset attribute of img to automatically load the adapter
    CSS Tutorial . Web Front-end 519 2025-07-10 13:49:41
  • How to handle unicode and UTF-8 strings in PHP
    How to handle unicode and UTF-8 strings in PHP
    The following points should be noted when dealing with Unicode and UTF-8 characters in PHP: 1. UTF-8 is used uniformly in all links, including HTML pages, PHP file saving formats and database connections; 2. Use mb_string extension to process multi-byte characters and replace native string functions; 3. Add the JSON_UNESCAPED_UNICODE parameter to maintain UTF-8 output when encoding; 4. Use utf8mb4 character sets in database settings. PHP does not distinguish encoding by default, which can easily lead to garbled code or emoji exceptions. Therefore, it is necessary to ensure UTF-8 consistency from the input to the output, and correctly use relevant extensions and parameters to deal with character encoding issues.
    PHP Tutorial . Backend Development 164 2025-07-10 13:49:10
  • How to build RESTful APIs using PHP frameworks?
    How to build RESTful APIs using PHP frameworks?
    Common PHP frameworks for building RESTful APIs include Laravel, Lumen, and Slim. 1. Select the framework according to the project size. For example, Laravel is suitable for medium and large projects, Lumen is a lightweight and high-performance framework, and Slim is more suitable for small projects. 2. Define a routing structure that conforms to resource semantics, such as GET/users obtains all users, and GET/users/1 obtains the specified user. 3. Use the controller to process logic to keep the code neat and define the route through Route::apiResource or manual registration. 4. Unifiedly return the JSON response format, including status code, message and data body, and improve interface consistency. 5. Add authentication such as JWT or L
    PHP Tutorial . Backend Development 228 2025-07-10 13:46:30
  • PHP header location ajax call not working
    PHP header location ajax call not working
    The reason why header('Location:...') in AJAX request is invalid is that the browser will not automatically perform page redirects. Because in the AJAX request, the 302 status code and Location header information returned by the server will be processed as response data, rather than triggering the jump behavior. Solutions are: 1. Return JSON data in PHP and include a jump URL; 2. Check the redirect field in the front-end AJAX callback and jump manually with window.location.href; 3. Ensure that the PHP output is only JSON to avoid parsing failure; 4. To deal with cross-domain problems, you need to set appropriate CORS headers; 5. To prevent cache interference, you can add a timestamp or set cache:f
    PHP Tutorial . Backend Development 527 2025-07-10 13:46:11
  • What are the most common HTML tags?
    What are the most common HTML tags?
    The most commonly used tags in HTML include titles, paragraphs, links, images, lists, and layout elements. Specifically: 1. Use the title, the most important one should be per page; 2. Use the paragraph; 3. Use the hyperlink through; 4. Use the picture to use self-closed and need to add the alt attribute; 5. Use the unordered list and ordered list, both list items; 6. Layout is often used for semantic but flexible block-level and inline. Mastering these tags can build a basic web page structure.
    HTML Tutorial . Web Front-end 761 2025-07-10 13:45:51
  • Controlling flex item wrapping behavior with css flex-wrap
    Controlling flex item wrapping behavior with css flex-wrap
    flex-wrap controls the line wrapping behavior of child elements of elastic containers. It has three values: nowrap (there is no line break by default), wrap (the line break is allowed, the direction is from top to bottom, left to right), wrap-reverse (the line break is allowed, the direction is from bottom to top). If the project does not wrap the line as expected, it may be due to the project width being too small or too large and the container width being undefined. It can be adjusted by min-width, percentage width or flex-grow respectively. After a row-gap and column spacing can be set through row-gap and column-gap. wrap-reverse is often used in special layouts such as bottom alignment or reverse arrangement. Use flex-wrap reasonably to combine width and spacing settings to achieve flexible layout effects
    CSS Tutorial . Web Front-end 536 2025-07-10 13:44:01

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