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- How to use the CSS :has() pseudo-class
- :has() is a pseudo-class in CSS. It can choose a parent element or previous element that contains a specific child element or subsequent sibling element to implement content-based style design. 2. Its syntax is element:has(selector), for example, div:has(p) selects a div containing the p element. 3. Browser support continues to grow, and Chrome, Safari and Edge have been supported since 2024. 4. It can be used to select the parent element according to the child element, such as .card:has(h2,img) to add borders to cards that contain both h2 and img. 5. Can style links containing specific content, such as a:has(svg.external-icon) with external icon svg
- CSS Tutorial . Web Front-end 994 2025-09-21 01:52:01
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- How to update a row if it exists or insert if not in MySQL
- INSERT...ONDUPLICATEKEYUPDATE implementation will be updated if it exists, otherwise it will be inserted, and it requires unique or primary key constraints; 2. Reinsert after deletion of REPLACEINTO, which may cause changes in the auto-increment ID; 3. INSERTIGNORE only inserts and does not repetitive data, and does not update. It is recommended to use the first implementation of upsert.
- Mysql Tutorial . Database 168 2025-09-21 01:45:02
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- What is a doctype in html?
- DOCTYPEstandsforDocumentTypeDeclarationandisnotanHTMLtagbutadirectiveindicatingtheHTMLversion.Itensuresbrowsersrenderthepageinstandardsmode,avoidingquirksmodewithinconsistentbehavior.Overtime,differentHTMLversionsusedvariousdoctypes,suchasHTML4.01Str
- HTML Tutorial . Web Front-end 326 2025-09-21 01:29:09
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- How to use namespaces in a PHP project?
- NamespacesinPHPorganizecodeandpreventnamingconflictsbygroupingclasses,interfaces,functions,andconstantsunderaspecificname.2.Defineanamespaceusingthenamespacekeywordatthetopofafile,followedbythenamespacename,suchasApp\Controllers.3.Usetheusekeywordtoi
- PHP Tutorial . Backend Development 482 2025-09-21 01:28:01
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- How to validate an email address in PHP?
- Use filter_var() to verify the mailbox format, and then check the domain name MX record through checkdnsrr() to enhance verification. The sample code shows basic usage and encapsulation functions, recommend server-side verification, avoid regularity, and ensure data reliability.
- PHP Tutorial . Backend Development 914 2025-09-21 01:14:01
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- What is the spellcheck attribute in HTML
- Spellcheck attribute is used to control whether element content is spellcheck. The answer is: 1. Set spellcheck="true" to enable spellcheck, and the browser will mark spell errors; 2. Set spellcheck="false" to disable spellcheck, which is often used for special inputs such as code or usernames; 3. This attribute is only valid for editable elements (such as contenteditable or form input); 4. Spellcheck depends on the user's browser and system language settings, and it is recommended to combine lang attributes to improve accuracy; 5. Most modern browsers support this function, but visual prompts may be different, and the final effect is based on the user environment.
- HTML Tutorial . Web Front-end 266 2025-09-21 01:00:07
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- WooCommerce Shopping Cart Multi-Product Similar Surcharge Intelligent Summary Tutorial
- This article details how to correctly calculate and summarize fees for multiple products belonging to the same surcharge category in WooCommerce shopping cart. In response to the problem that fees cannot be accumulated in existing code, the tutorial provides an optimized PHP solution. By defining the product ID as an array and introducing the total_amount counter, it ensures that the surcharges of the same category can be accurately accumulated based on the quantity and unit price of related products in the shopping cart, thereby achieving more flexible and professional fee management.
- PHP Tutorial . Backend Development 643 2025-09-21 00:48:01
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- Use the WooCommerce REST API to obtain user information: permission issues and solutions
- This article aims to help developers resolve the "woocommerce_rest_cannot_view" error encountered when obtaining user information using the WooCommerce REST API, and provide an alternative to passing authentication information through query strings to successfully obtain user data.
- PHP Tutorial . Backend Development 577 2025-09-21 00:45:01
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- Laravel Multi-file Upload: Complete Tutorial on Processing Image Arrays and Dynamic Forms
- This tutorial explains in detail how to correctly handle multi-file uploads in a Laravel application, especially for image arrays submitted through dynamic forms. The content covers front-end form configuration, verification and iterative processing of file arrays in back-end controllers, generation of unique file names, different file storage policies (public directories and storage disks), and how to associate file paths with database records, and provides complete code examples and best practice suggestions to help developers build robust file upload functions.
- PHP Tutorial . Backend Development 225 2025-09-21 00:30:02
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- How to make a deep copy or clone of an object in PHP?
- Useunserialize(serialize($obj))fordeepcopyingwhenalldataisserializable;otherwise,implement__clone()tomanuallyduplicatenestedobjectsandavoidsharedreferences.
- PHP Tutorial . Backend Development 349 2025-09-21 00:30:02
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- How to merge two arrays in PHP?
- Usearray_merge()tocombinearrays,overwritingduplicatestringkeysandreindexingnumerickeys;forsimplerconcatenation,especiallyinPHP5.6 ,usethesplatoperator[...$array1,...$array2].
- PHP Tutorial . Backend Development 581 2025-09-21 00:26:01
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- What is connection pooling in MySQL?
- ConnectionpoolingisnotanativefeatureofMySQLbutisimplementedbyapplicationstoreusedatabaseconnectionsefficiently.Itworksbymaintainingapoolofready-to-useconnectionsthatareborrowedandreturnedinsteadofrepeatedlycreatingandclosingnewones,reducingconnection
- Mysql Tutorial . Database 728 2025-09-21 00:16:01
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- How to prevent images from stretching or shrinking with CSS
- Useobject-fitormax-widthwithheight:autotopreventimagedistortion;object-fitcontrolshowimagesfillcontainerswhilepreservingaspectratios,andmax-width:100%;height:autoensuresresponsivescalingwithoutstretching.
- CSS Tutorial . Web Front-end 924 2025-09-21 00:04:01
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- Deep understanding of iframe event capture and cross-domain security restrictions
- This article explores the challenge of catching mousedown events on parent divs containing iframes. The core problem is the browser's homologous policy, which prevents the parent page JavaScript from directly accessing or listening to events inside a cross-domain iframe, causing the events to bubble up to the parent element. It is almost impossible to directly capture mouse events in third-party iframes unless the iframe content source is controlled at the same time and CORS configuration is performed.
- HTML Tutorial . Web Front-end 768 2025-09-20 23:48:02
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