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  • How do I create objects from classes in PHP?
    How do I create objects from classes in PHP?
    To create an object in PHP, you must first define the class and then instantiate it with the new keyword. 1. Classes are blueprints of objects, defining attributes and methods; 2. Create object instances using new; 3. Constructors are used to initialize different data; 4. Access attributes and methods through ->; 5. Pay attention to access control of public, private, and protected; 6. Multiple independent instances can be created, each maintaining its status. For example, after defining the Car class, newCar('red') creates an object and passes a parameter, $myCar->startEngine() calls the method, and each object does not affect each other. Mastering these helps build clearer, scalable applications.
    PHP Tutorial . Backend Development 844 2025-06-24 00:29:21
  • What is the element, and why is it the root element of an HTML page?
    What is the element, and why is it the root element of an HTML page?
    The "html" tag is the root element of an HTML page, which wraps everything on the page. The root element is the outermost container in HTML documents. In HTML, this role belongs to the "html" tag. All other elements are contained inside the "html" tag and are divided into "head" or "body" parts. The reasons for choosing "html" as the root element include: 1) Clear structure, which is convenient for browser parsing and rendering; 2) Used to declare language attributes, improve accessibility and SEO; 3) Define XML namespace in XHTML to ensure system compatibility. Common errors include forgetting to add the "html" tag, using multiple "html" tags, or placing content outside the "html" tag. Although now
    HTML Tutorial . Web Front-end 676 2025-06-24 00:29:02
  • What are Enums in PHP 8.1?
    What are Enums in PHP 8.1?
    EnumsinPHP8.1 provides a native way to define named value collections, improving code readability and type safety. 1. Use enum keyword definition to support associative scalar values ??(such as strings or integers) or pure enums; 2. Enumerations have type checks to avoid illegal values ??being passed in; 3. Provide cases() to obtain all options, tryFrom() safely converts the original value to an enum instance; 4. It does not support inheritance or direct instantiation, and pay attention to manual conversion when interacting with the database/API; 5. Applicable to fixed value collections, it is not recommended to use frequently changing values. Compared with the old version of constant simulation enumeration method, PHP8.1 enumeration reduces redundant logic and improves code structure clarity.
    PHP Tutorial . Backend Development 964 2025-06-24 00:28:20
  • What are container queries and how do they differ from media queries?
    What are container queries and how do they differ from media queries?
    Containerqueriesallowstylingelementsbasedontheircontainer'ssize,unlikemediaqueriesthatrelyontheviewport.1.Mediaqueriestargettheviewportandareidealforgloballayoutchangesbutlackcontroloverindividualcomponentsindifferentlayouts.2.Containerqueriestargeta
    CSS Tutorial . Web Front-end 239 2025-06-24 00:26:40
  • What is the CSS object-fit property for images and videos?
    What is the CSS object-fit property for images and videos?
    Theobject-fitCSSpropertycontrolshowimagesorvideosscalewithintheircontainer.1.fillstretchesmediatofit,possiblydistortingit.2.containscalesmediatofitentirelywithinthecontainerwhilepreservingaspectratio.3.coverscalesmediatocovertheentirecontainer,croppi
    CSS Tutorial . Web Front-end 1019 2025-06-24 00:25:41
  • What is the difference between a CSS transition and a CSS animation?
    What is the difference between a CSS transition and a CSS animation?
    CSS transitions are suitable for simple state changes, while CSS animations are used for complex effects. 1. The transition only supports start and end states, which are suitable for simple interactions such as button hovering; 2. The animation provides complete control through keyframes, suitable for scenes with looping playback or precise timing; 3. Both should be given priority to use opacity and transform attributes for best performance; 4. It should be selected according to needs to avoid unnecessary animations distracting users.
    CSS Tutorial . Web Front-end 470 2025-06-24 00:24:11
  • What does the animation-direction property do (e.g., alternate)?
    What does the animation-direction property do (e.g., alternate)?
    Theanimation-directionpropertyinCSScontrolsthedirectionofananimationacrosscycles,offeringfourvalues:1.normalplaystheanimationforwardeachtime,2.reverseplaysitbackward,3.alternatereversesdirectiononeverycyclestartingforward,and4.alternate-reversestarts
    CSS Tutorial . Web Front-end 503 2025-06-24 00:23:51
  • What do the flex-grow, flex-shrink, and flex-basis properties do?
    What do the flex-grow, flex-shrink, and flex-basis properties do?
    In a Flexbox layout, flex-grow, flex-shrink, and flex-basis are the three core attributes that control the behavior of child elements. 1.flex-grow determines how much the element can expand when there is extra space, and the larger the value, the larger the proportion; 2.flex-shrink determines the proportion of element shrinkage when there is insufficient space, and the larger the value, the more shrinkage; 3.flex-basis is the initial size of an element before it is stretched and can be set to a fixed value or percentage. They are usually set together by flex abbreviation properties. For example, flex:11200px means that equal proportion expansion and shrinkage are allowed, and adjusted from 200px as the starting point, thereby achieving a flexible and controllable layout effect.
    CSS Tutorial . Web Front-end 150 2025-06-24 00:20:30
  • How can you style scrollbars in CSS?
    How can you style scrollbars in CSS?
    Yes,youcanstylescrollbarsinCSS,butthelevelofcontrolvariesbybrowser.TocustomizescrollbarsforapolishedUI,use::-webkit-scrollbarpseudo-elementsforWebKitbrowsers(Chrome,Edge,Safari),allowingfullcustomizationlikecolors,sizes,andhovereffects.ForFirefox,app
    CSS Tutorial . Web Front-end 787 2025-06-24 00:18:22
  • How do I use the src attribute to specify the URL of the audio file?
    How do I use the src attribute to specify the URL of the audio file?
    The method to specify the audio file URL using the src attribute is: add the src attribute in the tag and set the audio file path. The specific steps are as follows: 1. The basic syntax is, where src is used to specify the path, and controls is used to display the playback controls; 2. The common supported formats include .mp3, .wav, and .ogg. If it needs to be compatible with multiple browsers, multiple formats can be provided by tags; 3. The path can be selected from relative paths or absolute paths, which are suitable for internal resources and external links respectively; 4. Pay attention to cross-domain issues, preload settings, and automatic playback restrictions (need to be used with muted). After correct configuration, audio playback can be achieved.
    HTML Tutorial . Web Front-end 709 2025-06-24 00:17:51
  • How does CSS will-change property help with performance?
    How does CSS will-change property help with performance?
    Thewill-changepropertyinCSSsignalsthebrowserthatanelementisabouttochange,allowingittooptimizerendering.1.Itinformsthebrowserwhichpropertieswillchange,suchastransform,opacity,scroll-position,orcontents.2.Thebrowsermaythenpromotetheelementtoitsownlayer
    CSS Tutorial . Web Front-end 376 2025-06-24 00:17:01
  • How do I access form data submitted via GET using the $_GET superglobal?
    How do I access form data submitted via GET using the $_GET superglobal?
    ToaccessformdatasubmittedviatheGETmethodinPHP,usethe$_GETsuperglobalarray.1)Onlyinputfieldswithanameattributeareincludedinthe$_GETarray.2)ValuesappearasstringswithspacesconvertedtoplusesandspecialcharactersURL-encoded.3)Alwayscheckifakeyexistsusingis
    PHP Tutorial . Backend Development 721 2025-06-24 00:14:40
  • How do I add a table footer using the element?
    How do I add a table footer using the element?
    To add a table footer, use elements and place them within the structure, usually after, before closing the table. 1. Used to wrap footer rows, it can contain one or more elements, and cells are used or defined; 2. In the basic structure, it stores the table header, contains data rows, and places summary information; 3. The footer can be styled through CSS, such as bold, background color or text alignment; 4. Compared with ordinary lines, it has better semantic and auxiliary functions support, and can be displayed repeatedly when paging printing.
    HTML Tutorial . Web Front-end 237 2025-06-24 00:10:02
  • What are the transaction isolation levels in MySQL, and which is the default?
    What are the transaction isolation levels in MySQL, and which is the default?
    MySQL's default transaction isolation level is RepeatableRead, which prevents dirty reads and non-repeatable reads through MVCC and gap locks, and avoids phantom reading in most cases; other major levels include read uncommitted (ReadUncommitted), allowing dirty reads but the fastest performance, 1. Read Committed (ReadCommitted) ensures that the submitted data is read but may encounter non-repeatable reads and phantom readings, 2. RepeatableRead default level ensures that multiple reads within the transaction are consistent, 3. Serialization (Serializable) the highest level, prevents other transactions from modifying data through locks, ensuring data integrity but sacrificing performance;
    Mysql Tutorial . Database 841 2025-06-23 15:05:11

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