This article provides a comprehensive guide on how to use PHP for web scraping and data extraction, covering HTTP requests with cURL, HTML parsing using regular expressions and DOMDocument. Through practical examples, you'll learn essential techniques to retrieve and process web data efficiently.

In PHP development, we often need to round floating point numbers. Although the intval() function can convert variables into integers, it does not support upward rounding (i.e., "ceiling" operation), it simply truncates the fractional part and rounds the result downward. In order to achieve the effect of upward rounding, it is usually necessary to use it in conjunction with other functions, such as ceil().

This article details how to combine PHP and Swoole technology to build a high-availability, high-performance e-commerce platform. Through proper architecture design and asynchronous processing, it achieves high concurrency response and stability, ideal for e-commerce developers and architects.

In PHP, when using the GD library to process images, we may encounter a problem: when calling the imagecolorallocatealpha function to set the image background transparent, after saving the image using imagepng(), the background of the image becomes black. This question often confuses developers, especially when dealing with PNG images with transparent backgrounds. This article will explain in detail why this happens and give a solution.

Arrays are very commonly used data structures. During the development process, we often encounter situations where we need to remove the empty value of the array and rebuild the array index. Fortunately, PHP provides array_filter() and array_values() functions to help us easily accomplish this task.

In PHP, the array_filter() and array_reduce() functions are very useful tools for filtering and aggregating arrays, respectively. They can help developers simplify code, improve code readability and efficiency. This article will use examples to demonstrate how to use these two functions for data filtering and aggregation.

In PHP, we often need to deduplicate the array or filter invalid elements. To accomplish these tasks, PHP provides many built-in functions, where array_filter() and array_unique() are two very commonly used functions. Today we will explore how to combine these two functions to deduplicate effective elements in an array.

In PHP development, we often need to filter out elements that meet specific conditions from an array. array_filter() is a powerful tool to deal with this requirement, and regular expressions can come in handy when you want to perform more complex matches (such as pattern recognition, keyword filtering, etc.).

During the daily development process of Laravel, we often encounter scenarios where "invalid" data in the array need to be cleaned. For example, fields that are not filled in the form, values ​​that are empty in API parameters, or data items need to be filtered based on certain logic. And array_filter() is a powerful tool to deal with these problems.

array_filter() is a very practical function that can filter elements in an array with customization. By passing in a callback function, we can retain or remove elements from the array based on specific logical conditions. In this article, we will explain how to use array_filter() to filter out all integer terms in an array.

array_filter() is a very commonly used function in PHP, which is used to filter elements in an array based on callback functions. When you pass an array to array_filter(), it will iterate over the array and determine which elements are preserved and which elements are removed based on the return value of the callback function you provide. Although most of the applications of array_filter() focus on handling simple arrays, there are some special things in behavior when applied to arrays containing objects.

In PHP, the crypt() function is an important tool for hash encryption, which supports a variety of encryption algorithms, including Blowfish (usually expressed as $2y$) and SHA-512 (used as $6$). Both algorithms are widely used for password hashing and verification, but they differ significantly in performance and applicable scenarios. This article will discuss the performance comparison of Blowfish and SHA-512 in the PHP crypt() function in detail, and analyze its advantages and disadvantages based on examples.

How to use array_filter() in combination with is_array() function to filter array elements in an array?

In PHP, the stream_context_get_options function is very useful when using a stream context, which can be used to confirm whether certain options are successfully set in the stream context, such as timeout or User-Agent.

When using PHP for network programming, especially when it comes to socket connections or database connections, you often encounter the error message of "Connection refused". This error usually means that the server port the PHP program is trying to connect to is not responding, or the target server does not enable the related service.

This article provides a detailed guide on implementing user authentication and authorization in PHP using JWT (JSON Web Token). It explains how to integrate the Firebase JWT library and includes complete code examples suitable for both beginners and experienced developers.

The crypt() function is used to encrypt strings, especially for password hashing. Its implementation and performance do not rely solely on PHP itself, but deeply rely on the encryption library at the bottom of the system, especially the password encryption interface provided in the GNU C library (glibc). This article will explore its interaction with the underlying library of the system and its dependencies between the two based on the working mechanism of the crypt() function.

This article provides a step-by-step guide on how to efficiently create and manage website content using PHP and XML. Ideal for beginners and developers seeking a lightweight content management approach, it includes practical code examples to help you build a scalable and flexible site structure.

This article provides a comprehensive guide on integrating PHP with Unity3D using the Workerman framework to build a real-time multiplayer game architecture. It covers the complete process from backend server setup to Unity client-side implementation, making it a valuable reference for developers.