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  • How do you securely connect to a database using php?
    How do you securely connect to a database using php?
    To securely connect to a database in PHP, several critical steps are required. First, use PDO to prevent SQL injection with preprocessing statements to ensure that SQL logic is separated from data; second, store database credentials in non-Web root directory or use environment variable management through .env files, and avoid submission to version control; third, enable SSL encrypted database connections to ensure that the latest certificate is held; finally, properly handle error information, record errors internally instead of showing detailed content to users, thereby avoiding the leakage of sensitive information. The above measures jointly ensure the security of database connections.
    PHP Tutorial . Backend Development 675 2025-07-13 00:30:20
  • Choosing between em, rem, and px units in css
    Choosing between em, rem, and px units in css
    When selecting font size units, you should use px to fix the size; em to adjust the local relative size; rem to global control and responsive design. px is a fixed unit, suitable for borders, icons, and other scenes that do not require scaling; em is suitable for local styles such as button text relative to the parent element font size, but multi-layer nesting is prone to errors; rem is based on the root element html, which is convenient for unified control of the overall font size, and can realize responsive layout in conjunction with media queries, and is recommended for modern web development.
    CSS Tutorial . Web Front-end 749 2025-07-13 00:29:40
  • How to center a div horizontally and vertically using css
    How to center a div horizontally and vertically using css
    To center a div horizontally and vertically, 1. It is recommended to use Flexbox: set the container display:flex, and cooperate with justify-content and align-items as center; 2. Use Grid layout: set display:grid and place-items:center; 3. Traditional methods can use positioning and transform: set left and top to 50% and translate (-50%,-50%); note that the container must have a clear height, reasonably set parent positioning, and consider content overflow processing.
    CSS Tutorial . Web Front-end 393 2025-07-13 00:29:20
  • What are Traits in php and when should you use them?
    What are Traits in php and when should you use them?
    TraitsinPHPareamechanismforcodereuseacrossclasseswithoutinheritance,allowingmethodstobesharedamongunrelatedclasses.Theyhelpavoidcodeduplicationbyenablingtheinclusionofmethodcollectionsdirectlyintoclasses.Traitsshouldbeusedwhenmultipleunrelatedclasses
    PHP Tutorial . Backend Development 368 2025-07-13 00:21:10
  • What is the difference between role='button' and the element?
    What is the difference between role='button' and the element?
    Using native elements is usually better than role="button" because the former comes with interactive features and barrier-free support. 1. The default can focus and respond to Enter and Space keys; 2. Automatically submit forms and follow browser accessibility standards; 3. Role="button" requires manual keyboard interaction, focus style and ARIA attributes; 4. Role="button" should be used only in specific scenarios such as SVG or in restricted systems; 5. Use native buttons to save time and improve accessibility experience.
    HTML Tutorial . Web Front-end 212 2025-07-13 00:03:12
  • Scroll-Driven Sticky Heading
    Scroll-Driven Sticky Heading
    I was playing around with scroll-driven animations, just searching for all sorts of random things you could do. That’s when I came up with the idea to animate main headings and, using scroll-driven animations, change the headings based on the user’s
    CSS Tutorial . Web Front-end 376 2025-07-12 09:34:15
  • Using CSS filters for visual effects
    Using CSS filters for visual effects
    CSS filters can achieve a variety of visual effects. 1. Use grayscale() to convert the picture into a grayscale diagram, which is often used for interactive state switching; 2. blur() realizes Gaussian blur, suitable for background blur and other scenarios; 3. Adjust the brightness, contrast and saturation through brightness(), contrast(), and saturate() respectively, and use it in combination to create a diverse tone; 4. Multiple filters can be used by superimposing spaces, but attention should be paid to the order and performance impact. These filters are simple and efficient, suitable for enhancing page expression.
    CSS Tutorial . Web Front-end 954 2025-07-12 03:22:20
  • How to use CSS custom properties for theming tutorial
    How to use CSS custom properties for theming tutorial
    CSS custom attributes are a flexible way to implement theme switching. They abstract colors, fonts and other styles for easy management and dynamic modification. Compared to traditional multi-CSS files or preprocessor variables, CSS variables support runtime changes, suitable for dark mode and user-defined themes. It is recommended to define default variables in :root, create classes such as .dark for different topics, and toggle class names through JS to achieve dynamic topic switching. At the same time, you can use localStorage to remember user selections. Pay attention to variable scope, fallback value, performance and compatibility issues in details.
    CSS Tutorial . Web Front-end 546 2025-07-12 03:22:01
  • Understanding the css box-sizing property: content-box vs border-box
    Understanding the css box-sizing property: content-box vs border-box
    Why does a box with a width of 100px be displayed wider? Because the content-box model is used by default, the actual width includes content, padding and border. 1. By default, box-sizing is content-box, and the width set only refers to the content area. padding and border will add additional overall width; 2. Use border-box to make the width set include content, padding and border, and the layout is more intuitive; 3. It is recommended to set box-sizing: border-box globally to avoid layout misalignment, which is especially suitable for responsive design; 4. Conte can be used in special scenarios
    CSS Tutorial . Web Front-end 330 2025-07-12 03:21:20
  • Troubleshooting CSS `z-index` stacking contexts
    Troubleshooting CSS `z-index` stacking contexts
    The reason why z-index does not take effect is the effect of the stacking context. ①z-index is only valid for positioning elements and must be in the same stacking context; ② stackingcontext is an independent space created by the parent element, and the stacking order of child elements is only effective in that space; ③ The way to create a new stackingcontext includes using transform, opacity, filter and other attributes; ④ Common problems are that z-index in different stackingcontexts cannot be directly compared, so you need to check whether the common ancestor has created stackingcontext; ⑤ The troubleshooting method is to view the parent element style through the developer tool
    CSS Tutorial . Web Front-end 770 2025-07-12 03:20:30
  • What is a CSS Box Model tutorial?
    What is a CSS Box Model tutorial?
    TheCSSBoxModelisessentialforcontrollingwebpagelayout,aseveryelementistreatedasaboxwithfourcomponents:content,padding,border,andmargin.1.Thecontentareaholdstextorimages.2.Paddingaddsinternalspacebetweencontentandborder.3.Borderwrapsaroundpaddingandcon
    CSS Tutorial . Web Front-end 666 2025-07-12 03:20:10
  • Creating modal windows or lightboxes with css
    Creating modal windows or lightboxes with css
    Modal windows and light boxes can implement basic functions through pure CSS without JavaScript. 1. Use: The target pseudo-class can control the display status based on URL anchor points. The advantage is that there is no script required, but the mask cannot be closed; 2. Use hidden checkbox and label to achieve more flexible interaction, such as clicking mask to close and adding animation transitions; 3. Pay attention to optimization details such as compatibility, accessibility (such as adding aria-label), and preventing background scrolling (using overflow:hidden). The two methods have their own applicable scenarios, suitable for static pages or lightweight projects.
    CSS Tutorial . Web Front-end 993 2025-07-12 03:18:41
  • Working with CSS Blend Modes for creative design
    Working with CSS Blend Modes for creative design
    CSSBlendModes realizes color fusion between elements through mix-blend-mode and background-blend-mode attributes, improving the visual level. 1. Mix-blend-mode controls the mixing method of elements and the content below; 2. Background-blend-mode controls the mixing between multiple background layers; 3. Common modes such as multiply, screen, and overlay can be used for background overlay, text effects and card light and shadow effects; 4. When using it, you need to pay attention to compatibility, performance impact, color control and hierarchical structure issues.
    CSS Tutorial . Web Front-end 320 2025-07-12 03:18:00
  • How is specificity calculated for CSS Selectors?
    How is specificity calculated for CSS Selectors?
    CSS specificity is the mechanism by which browsers decide which style is preferred among multiple conflict rules. It calculates weights based on the structure of the selector, not the order of the code. Specificity consists of four digits: a (inline style), b (ID selector), c (class, attribute, pseudo-class), d (element, pseudo-element). For example, the specificity of p is (0,0,0,1), #mainp is (0,1,0,1), and style="..." is (1,0,0,0). A common misunderstanding is that multiple classes can exceed IDs, but they are not. It is recommended to use less ID styles and use more class combinations to avoid abuse of !important to improve maintainability.
    CSS Tutorial . Web Front-end 354 2025-07-12 03:17:40

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