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Article Introduction：Bootstrap lists provide a variety of list styles, including unordered lists, ordered lists and description lists. By using class names such as list-group and list-group-item, you can easily create beautiful and consistent lists. In addition, Bootstrap supports creating complex lists with icons, links, and flexible layouts, but be careful to use them properly to avoid performance issues and keep the code simple and easy to read.

2025-04-07 comment 0  854

Article Introduction：To scrape links from a webpage using PHP, you can use the file_get_contents function to fetch the HTML content and then parse it using the DOMDocument class. Here's a simple example: Site : SportsFire

2024-10-17 comment 0  475

Article Introduction：There are three ways to implement deep copy of arrays in PHP: First, use unserialize and serialize to disconnect references by serializing and deserializing, which is suitable for ordinary and nested arrays; second, object arrays combine clone and recursive functions to flexibly process mixed types but ensure that the class supports correct cloning; third, json_encode and json_decode are suitable for pure scalar data, with simple writing but no resources or special objects.

2025-07-14 comment 0  979

Article Introduction：How to use PHP to get the number of days in a certain month? 1. Use the cal_days_in_month function, which is the most direct way. The syntax is cal_days_in_month(CAL_GREGORIAN, $month, $year); 2. Use the DateTime class and modify method to create the first day of the month and get the date of the last day by adding one month and subtracting one day. Both methods can correctly obtain the number of days. The former is simple and suitable for simple needs, while the latter is suitable for scenarios where DateTime operations are already available or requires more time to process.

2025-07-06 comment 0  854

Article Introduction：Implementing LRU cache in PHP can simulate bidirectional linked list structure by using associative arrays and index arrays. The specific steps are as follows: 1. Create an LRUCache class and initialize an array of capacity, cache and access order. 2. Implement the get method, return the value and update the access order. 3. Implement the put method, add or update elements, and remove the longest-lasting elements if necessary. This method is simple and easy to understand, but performance may decline under large data volumes.

2025-05-23 comment 0  681

Article Introduction：PHP iterator and generator: a powerful tool for efficient processing of large data sets Arrays and iterations are the cornerstone of any application. As we get new tools, the way we use arrays should also improve. For example, a generator is a new tool. At first we only have arrays, and then we gain the ability to define our own class array structure (called iterators). But since PHP 5.5, we can quickly create class iterator structures called generators. Generators look like functions, but we can use them as iterators. They provide us with a simple syntax for creating essentially interruptible, repeatable functions. They are amazing! We will look at several areas where generators can be used and explore the need to note when using generators

2025-02-16 comment 0  504

Article Introduction：There are two main methods for comparing two dates in PHP: 1. Use the DateTime class for comparison, which is suitable for handling complex date logic, supports direct use of comparison operators, and the code is clear and not prone to errors; 2. Use the strtotime() function to convert dates to timestamps and compare them, which is suitable for simple scenarios but pay attention to format limitations. In addition, the time zone and date formats are also required, and the null value processing is done to ensure that the comparison results are accurate and reliable.

2025-07-05 comment 0  368

Article Introduction：Writing PHP block comments should be standardized and practical, and is suitable for instructions on large segments of structured code such as functions, classes, and file headers. 1. Usage scenarios include function description, class design intention, complex logical process, copyright information, etc.; 2. The standard format adopts /.../ package, follows the PSR-5 standard, summarizes the first line in one sentence, explains in detail after emptying the line, and uses @param, @return, @throws and other tags to explain the parameters and return values; 3. Practical suggestions include keeping the content concise, aligning and beautiful, avoiding redundancy, and regularly maintaining the consistency of annotations; 4. Common misunderstandings such as inconsistent annotations and code, ignoring the use of tags, and verbose content, you should use the IDE to automatically generate templates to improve efficiency. Standardized block annotations help improve code readability and teamwork

2025-07-15 comment 0  893

Article Introduction：There are three main ways to convert date formats in PHP. 1. Use date and strtotime to combine to be suitable for simple conversion in standard formats, such as converting yyyy-mm-dd to dd-mm-yyyy; 2. Use the DateTime class to be suitable for handling complex scenarios such as addition and subtraction days or object-oriented style development; 3. Non-standard formats can be regularly extracted or introduced into third-party libraries such as Carbon to parse and format output.

2025-07-04 comment 0  410

Article Introduction：The key to PHP regular expression performance optimization is to reduce the number of backtracking and matches; 1. Avoid greedy matching and backtracking, use non-greedy patterns, avoid nested quantifiers, and reduce the use of capture groups; 2. Compile regular expressions in advance, and use static variables or class constant storage to reduce the overhead of repeated parsing; 3. Prioritize string functions to replace simple matching tasks, such as strpos, substr, etc. to improve efficiency; 4. Use anchor points and boundary control characters such as ^, $, and \b to limit the matching range to speed up the engine judgment.

2025-07-06 comment 0  448

Article Introduction：In PHP, the time information is ignored when extracting the date part in PHP, the following methods can be adopted: 1. Use date() and strtotime() to parse the string date and format the output, which is suitable for standard formats; 2. Use the DateTime class to provide more flexible operations such as time zone, date addition and subtraction, etc.; 3. When processing user input, you can use DateTime::createFromFormat() or regular extraction of the date part, pay attention to verifying the input to avoid errors. Select the appropriate method according to the scene, use date() to strtotime() for simple conversion, and complex logic takes DateTime.

2025-07-17 comment 0  966

Article Introduction：Core points Symfony Console is a standalone package that provides a simple framework for creating command line tools, which is useful for repetitive tasks such as data migration, importing, or creating cron jobs. To create a new command, you need to make the file executable. This can be done by creating a console file in the project root directory, ensuring the file is executable, and defining the console application. You can use Symfony's CommandTester class to test commands, which provides special input and output classes to test commands without the command line. Symfony Console is installed using Composer (the dependency management tool in PHP). It provides a simple

2025-02-10 comment 0  770

Article Introduction：There are several ways to get the start time of a week in PHP: 1. Use the DateTime class to get the Monday of this week, which is suitable for situations where Monday is the week; 2. Customize the start day of the week, and dynamically set Monday or Sunday as the starting point by judging the current week; 3. Get the start time of the week where the specified date is, which is suitable for processing data that is not the current date; 4. Use strtotime to quickly implement it, which is suitable for simple scenarios but is not recommended for complex logic. You can choose the appropriate method according to project needs, and the DateTime class is clearer and more reliable.

2025-07-08 comment 0  806

Article Introduction：Imagick PHP extension library details: Add text watermark to images This article will explain how to use PHP's Imagick extension library to add text watermarks to images. We will explore a variety of methods, including simple text overlay, creating transparent text watermarks using font masks, and more advanced text tiling techniques. Key points: Imagick is a powerful PHP extension library that can be used to process images, including adding text watermarks. Text watermarking can be achieved by creating an Imagick class instance, reading an image, setting the font properties using the ImagickDraw instance, and then adding text to the image using the annotateImage() method. There are many ways to add text

2025-02-25 comment 0  343

Article Introduction：In PHP, there are four methods to use callback functions, namely: 1. Use named functions as callbacks, by passing the function name as a string to functions such as array_map; 2. Use anonymous functions (closures), which are suitable for situations where logic is simple and only used once; 3. Use object methods as callbacks, by passing an array containing object and method names; 4. Use static methods as callbacks, you can add strings of method names through array syntax or class names. Each method has its applicable scenarios, and it is necessary to ensure that the callback is accessible and its validity can be verified through is_callable().

2025-07-21 comment 0  417

Article Introduction：There are three main ways to convert objects into arrays in PHP. 1. Use (array) casting is suitable for simple objects, but private attributes will be prefixed with class name, affecting the key name; 2. Use json_encode and json_decode to process nested structures and ignore access modifiers, but resources and closures will be discarded; 3. Write recursive functions to finely control the conversion process, which is suitable for complex object structures, and can expand processing logic; in addition, attention should be paid to the impact of access control on key names, the inability to convert resources and closures, the need for additional processing of special objects, and performance problems. Just select the appropriate method according to the object structure and needs.

2025-07-21 comment 0  576

Article Introduction：PHP date format conversion is mainly implemented in two ways. First, use the combination of date() and strtotime() functions, which are suitable for most standard format conversions, but have limited support for non-standard formats; second, use the DateTime class to deal with more complex scenarios, such as time zone conversion and multilingual support, which has stronger readability and fault tolerance; in addition, you also need to master common format characters, such as Y represents a four-bit year, m represents a month with a leading zero, and d represents a date with a leading zero, etc.; it is recommended to use date() in simple scenarios, and DateTime is preferred if it involves time zone or internationalization, and pay attention to verifying the legitimacy of the input.

2025-07-07 comment 0  896

Article Introduction：Many programmers like to talk about functional programming, but if you ask them if they have actually used it, most of the answers will be "no". The reason is simple: When we beginners in programming, we are taught to think in an imperative way, namely program flowcharts and steps. Therefore, this article will explain some important concepts of functional programming and how to write functional code in PHP. Key Points Functional programming treats calculations as evaluation of mathematical functions, and avoids state and mutable data, treating functions as first-class citizens. This means that functions can be used like values ??in imperative programming. Key concepts of functional programming include invariance (once defined, the value of a variable cannot be changed), recursion (used frequently due to invariance), pure functions (functions without side effects)

2025-02-24 comment 0  566

Article Introduction：Yes, the switch statement in PHP itself is not a code smell, but when it is repeated in multiple files, contains too many branches, is tightly coupled with business logic, violates the principle of single responsibility, or makes judgments based on object types, it becomes an anti-pattern; 1. Use policy mode processing factory: define processing interfaces and concrete classes, map types to processors through factory mapping, add new types only requires registration and no modification of existing code; 2. Use class-based distribution (polymorphism): let the object itself determine behavior, implement concrete logic by inheriting abstract classes, and directly execute methods when calling without switching; 3. Use closure mapping (suitable for simple scenarios): Use associative arrays to store the mapping of type to closures, avoid branch structure but are less testable; 4. PHP8 can be used

2025-08-02 comment 0  231

Article Introduction：In PHP, you can add hours to date and time by using the DateTime class with the modify() or add() method. Use the modify() method to pass in string parameters similar to '3hours' to directly modify the original object, which is suitable for simple adjustment; if you do not want to change the original object, you need to clone it before operating; use the add() method, you need to cooperate with the DateInterval object, such as 'PT2H', which means adding two hours, which is more suitable for structured development; when processing time zones, DateTimeZone should be set to ensure accuracy; for old versions of PHP, you can use strtotime() to implement it, but it is not recommended for complex logic. Choosing the right method to keep the code clear is key.

2025-07-08 comment 0  648