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  • how to check if a php array contains a specific string
    how to check if a php array contains a specific string
    TocheckifanarraycontainsaspecificstringinPHP,usein_array()forbasiccheckswithorwithoutstricttypecomparison.Forcase-insensitivesearches,implementcustomlogicusingstrtolower().Usearray_search()ifyouneedthekeyofthematchingelement.Handlenestedarraysbymanua
    PHP Tutorial . Backend Development 846 2025-07-06 01:54:11
  • Can a PHP function return an object?
    Can a PHP function return an object?
    PHP functions can return objects. 1. You can create objects directly in the function and return them, such as using stdClass or custom class instances; 2. It is often used to encapsulate data in the MVC framework to improve code readability and maintainability; 3. Support type prompts to enhance code robustness; 4. Pay attention to ensuring that the object is initialized correctly and handle possible failures, such as returning null or throwing exceptions.
    PHP Tutorial . Backend Development 522 2025-07-06 01:51:40
  • how to find if any value in a php array exists in another php array
    how to find if any value in a php array exists in another php array
    To determine whether at least one value exists in an array, it can be used to determine whether there is at least one value in another array or to optimize it manually. 1. Use the array_intersect() function to obtain the intersection of two arrays. If the result is not empty, there is a common value, which is suitable for most cases; 2. Use!empty() to directly judge the Boolean result, and the simplified logic is $hasCommon=!empty(array_intersect($array1,$array2)); 3. For large data volumes, you can first use array_flip() to convert one of the arrays into key-value pairs, and then traverse the other array to check whether it exists, improving search efficiency; 4. Notes include distinguishing types
    PHP Tutorial . Backend Development 247 2025-07-06 01:50:40
  • Controlling element visibility with display: none vs visibility: hidden in css
    Controlling element visibility with display: none vs visibility: hidden in css
    To select display:none or visibility:hidden depends on whether element space is retained; 1. display:none completely removes elements, does not occupy space, and is suitable for dynamic control display; 2. visibility:hidden retains space, only visually hidden, suitable for animation or layout maintenance; 3. Note that display:none does not trigger the rendering tree, and cannot obtain the size, while visibility:hidden can still obtain the size through JS.
    CSS Tutorial . Web Front-end 135 2025-07-06 01:49:11
  • How to specify the character encoding for an html document?
    How to specify the character encoding for an html document?
    There are three correct ways to specify character encoding of HTML documents: 1. Add in front of the HTML part, and it is recommended to follow the tag; 2. Configure the server to ensure that UTF-8 is sent, such as Apache uses AddDefaultCharsetUTF-8 or Nginx uses charsetutf-8; 3. Save the HTML file itself in UTF-8 encoding format, and set the correct output header when dynamically generating the page, while ensuring that external resources such as CSS and JavaScript also use UTF-8.
    HTML Tutorial . Web Front-end 223 2025-07-06 01:45:51
  • php check if time is between two times
    php check if time is between two times
    To determine whether the time is within a specified interval, you can convert the time and compare the timestamps by strtotime. 1. Use strtotime to convert the time string into a timestamp and compare it directly; 2. Spread the time to two situations to judge; 3. Times with dates can be directly compared with the complete date and time string.
    PHP Tutorial . Backend Development 960 2025-07-06 01:45:10
  • What are HTML entities and when to use them?
    What are HTML entities and when to use them?
    HTML entities are used to correctly display special characters in web pages. Because some characters such as & have special meanings in HTML, direct use may lead to browser parsing errors, so entity escapes are required, such as
    HTML Tutorial . Web Front-end 290 2025-07-06 01:43:52
  • Using CSS Preprocessors effectively to write CSS
    Using CSS Preprocessors effectively to write CSS
    Using CSS preprocessors can improve maintainability and clarity of style sheets. 1. Nesting rules make the structure more intuitive, such as writing ul, li and a styles in .nav according to HTML hierarchy relationships, but the nesting should not exceed three layers; 2. Variables and Mixin improve reusability, such as using $primary-color to define the main tone, or using @mixin to encapsulate common style blocks to reduce duplicate code; 3. Modularly organize the code structure, merge multiple small files through @import, and split styles according to functions, which facilitates team collaboration and post-maintenance.
    CSS Tutorial . Web Front-end 844 2025-07-06 01:39:10
  • 1_60. How do you make an animation run infinitely?
    1_60. How do you make an animation run infinitely?
    To make the animation loop infinitely, it needs to set its repetition mode to a continuous loop. 1. In CSS, use the animation-iteration-count property and set it to infinite; 2. In JavaScript library such as GSAP, set repeat to -1 and enable the loop option in Anime.js; 3. In mobile development, Android can set repeatCount to infinite through XML, and iOS uses the repeatForever method of SwiftUI. At the same time, attention should be paid to performance management, interactive control and cross-device testing.
    CSS Tutorial . Web Front-end 476 2025-07-06 01:38:30
  • php get quarter from date
    php get quarter from date
    To get quarters from dates, the core is to judge based on the month. 1. Use date() to obtain the month and determine the quarter based on if judgment, such as January-March is quarter 1, April-June is quarter 2, and so on; 2. Use the mathematical formula $quarter=ceil($month/3) to simplify the logic; 3. Support the incoming of custom date strings or timestamps, and the parameters can be omitted by default to use the current date; 4. Pay attention to ensuring that the date format is PHP and can be recognized, avoid parsing errors, and year must be considered when processing the inter-year data.
    PHP Tutorial . Backend Development 1001 2025-07-06 01:37:10
  • What is the difference between Sass and SCSS syntax?
    What is the difference between Sass and SCSS syntax?
    The main difference between Sass and SCSS is the syntax. SCSS uses curly braces {} and semicolon similar to standard CSS; to facilitate the transition from CSS, and supports direct copying of CSS code and adding variables, mixing and other functions; while Sass adopts indented syntax, no curly braces and semicolons are required, and relies on line breaks and spaces to define code blocks. It has a simpler style but is also easy to cause problems due to format errors. The two can be converted to each other through tools. Modern frameworks mostly use SCSS by default because they are easier to learn and have rich resources; file extensions are .sass and .scss respectively, and the choice should be based on personal or team preferences.
    CSS Tutorial . Web Front-end 261 2025-07-06 01:31:21
  • Optimizing CSS performance and file size
    Optimizing CSS performance and file size
    Optimizing CSS performance can improve loading speed and user experience. Specific methods include: 1. Reduce the complexity of selectors, replace multi-level nesting with class names, and avoid wildcards and excessive pseudo-class combinations; 2. Compress and merge CSS files, and use tools such as CSSNano to delete redundant content; 3. Prioritize loading of critical CSS and delay loading of non-critical styles; 4. Regularly check and delete unused redundant styles, and use DevTools and PurgeCSS to assist in cleaning.
    CSS Tutorial . Web Front-end 868 2025-07-06 01:30:31
  • how to get the first element of a php array
    how to get the first element of a php array
    There are 3 common methods to obtain the first element of the PHP array: 1. Use the reset() function to directly obtain the value, which is suitable for situations where only the value is needed without the key; 2. Use key() and reset() to obtain the first key-value pair, which is suitable for scenarios where the key name is needed; 3. Use array deconstruction assignment (PHP7.1) to extract the value concisely. Note that all methods need to determine that the array is not empty first to avoid errors.
    PHP Tutorial . Backend Development 311 2025-07-06 01:29:51
  • What is the difference between HTML and HTML5?
    What is the difference between HTML and HTML5?
    HTML5 brings more modern web functions than HTML. 1. Semantic tags such as, etc. have been introduced to improve readability and SEO; 2. Natively support multimedia tags and no need to rely on plug-ins; 3. New intelligent form controls such as email and date input types are added to optimize user experience and provide basic verification functions. These improvements make web pages more structured, interactive and adaptable to more devices.
    HTML Tutorial . Web Front-end 726 2025-07-06 01:28:12

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