Found a total of 10000 related content
CSS selector tutorial
Article Introduction：Element selectors, class selectors, ID selectors, and wildcard selectors are the most basic and commonly used selectors; 2. Descendants, children, neighboring brothers, and general brothers selectors achieve more precise element positioning through combination; 3. Attribute selectors match elements based on HTML attributes and their values, suitable for forms and dynamic content; 4. Pseudo-class selectors select elements based on element state (such as:hover, :focus) or structural position (such as:first-child, :nth-child); 5. Pseudo-element selectors (such as::before, ::after, ::first-line, ::first-letter) are used to style the virtual parts of elements; the selector priority is calculated by weight, ID
2025-07-28
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344
How to Autoload Classes in PHP 7?
Article Introduction：This article explains PHP 7's autoloading, using spl_autoload_register() to load classes on demand. It details best practices like namespace-based autoloading and caching for performance optimization, addresses common issues (e.g., class not found
2025-03-10
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1038
How to Calculate Age from Date of Birth in SQL and PHP?
Article Introduction：This article discusses two approaches for calculating a user's age based on their birth date: one using SQL and the other using PHP. The SQL approach involves utilizing the TIMESTAMPDIFF() function, while the PHP approach employs the DateTime class a
2024-10-24
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1198
How do I Calculate Age from Date of Birth in PHP and MySQL?
Article Introduction：This article discusses two methods for determining the age of an individual based on their date of birth using PHP and MySQL. The PHP method employs the DateTime class to compute the age difference. The MySQL method utilizes the TIMESTAMPDIFF() funct
2024-10-24
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383
Under the Hood of Yii's Component Architecture, Part 2
Article Introduction：This article continues our exploration of Yii Framework's CComponent class, focusing on event-driven programming in PHP. This is part 2 of a three-part series demonstrating how Yii leverages a component-based architecture to manage properties, confi
2025-03-01
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1084
Understanding CSS selectors tutorial
Article Introduction：CSS selector is a key tool for precise control of web elements in front-end development. 1. The basic selector includes element selectors (such as p), class selectors (such as .btn) and ID selectors (such as #header), which are used to match tags, reusable class names and unique IDs, respectively, and the difference is priority and usage scenarios; 2. Combination selectors achieve more precise selection through descendants (such as divp), offspring (such as ul>li), adjacent brothers (such as h1 p) and general brothers (such as h1~p) relationships; 3. Attribute selectors select elements based on attribute values, such as [type="text"], [href] and [class*="col-"]
2025-07-03
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321
Battle of the Autoloaders: PSR-0 vs. PSR-4
Article Introduction：Key Takeaways
PSR-0 and PSR-4 are autoloading standards in PHP, with PSR-0 defining paths based on a class’s namespace and allowing underscores in class names, while PSR-4 aims to simplify the folder structure and remove remnants of PSR-0.
PSR-4
2025-02-23
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312
Working With URIs in Laravel
Article Introduction：Laravel 11.35 introduces the Uri class based on the PHP League URI library. Uri simplifies the process of manipulating and processing URIs in Laravel applications and provides some convenient features about named routing.
Basic Operation
The core function of the Uri class is to create and manipulate URI strings, including queries, fragments, and paths:
use Illuminate\Support\Uri;
$uri = Uri::of('https://laravel-news.com')
->withPath('links')
->wit
2025-03-05
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826
How does garbage collection work in Java?
Article Introduction：Java's garbage collection (GC) is a mechanism that automatically manages memory, which reduces the risk of memory leakage by reclaiming unreachable objects. 1.GC judges the accessibility of the object from the root object (such as stack variables, active threads, static fields, etc.), and unreachable objects are marked as garbage. 2. Based on the mark-clearing algorithm, mark all reachable objects and clear unmarked objects. 3. Adopt a generational collection strategy: the new generation (Eden, S0, S1) frequently executes MinorGC; the elderly performs less but takes longer to perform MajorGC; Metaspace stores class metadata. 4. JVM provides a variety of GC devices: SerialGC is suitable for small applications; ParallelGC improves throughput; CMS reduces
2025-08-02
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638
How do CSS selectors (e.g., class, ID, attribute, pseudo-class, pseudo-element) target HTML elements?
Article Introduction：CSS selectors apply styles by matching elements in HTML structures. The main types include class selectors, ID selectors, attribute selectors, pseudo-classes and pseudo-elements. 1. The class selector starts with a dot (.) to match any element with a specific class name, which can be used in combination with the element type and avoid general naming; 2. The ID selector starts with a pound sign (#) to match the unique element in the page, and should be used with high priority with caution; 3. The attribute selector matches based on HTML attributes and their values, suitable for form or link filtering; 4. The pseudo-class starts with a colon (:) and applies styles according to the element status or location, such as:hover, :focus, etc.; 5. The pseudo-element starts with a double colon (::) and is used to modify part of the element's content or add the generated content.
2025-06-20
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278
Laravel error and exception handling
Article Introduction：Laravel's error and exception handling mechanism is based on the PHP exception system and Symfony component, and is managed uniformly by the App\Exceptions\Handler class. 1. Record exceptions through the report() method, such as integrating Sentry and other monitoring services; 2. Convert exceptions into HTTP responses through the render() method, supporting custom JSON or page jumps; 3. You can create custom exception classes such as PaymentFailedException and define their response format; 4. Automatically handle verification exception ValidationException, and manually adjust the error response structure; 5. Decide whether to display details based on the APP_DEBUG configuration.
2025-07-31
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723
php set date from string
Article Introduction：In PHP, there are two main methods: one is to use the DateTime class, and the other is to use the strtotime() function. 1. Use the DateTime class to be used for PHP5.3 and above, especially the DateTime::createFromFormat() method to parse strings in the specified format, such as $date=DateTime::createFromFormat('Y-m-d','2024-04-05'); 2. Use the strtotime() function to be suitable for processing natural language formats, such as strtotime("nextFriday"), but it is based on
2025-07-07
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633
