When using PHP's MySQLi extension for database operations, mysqli::real_connect and mysqli_stmt::attr_get are two important functions that are relatively low-level and easily overlooked. The former is used to establish a database connection, while the latter can be used to obtain some attribute states of preprocessing statements. In actual development, correctly understanding and using these two functions is of great significance to improving the stability and performance of database operations. This article will analyze the correct usage method of mysqli_stmt::attr_get, and combine the usage process of mysqli::real_connect to provide relevant information.

When using PHP for network programming, Socket is an important mechanism for implementing server-client communication. socket_accept() and socket_read() are key functions for handling client connections and reading messages. This article will explain in detail how to use these two functions to build a simple TCP server program to realize the function of receiving client messages.

In PHP development, constants are a very important part of them. They are used to store unchangeable values ​​for easy reuse in code. PHP provides a very practical function get_defined_constants() to get all defined constants in the current script. This article will introduce in detail the usage of the get_defined_constants() function and parse things to pay attention to when using it.

In PHP, the GD library is a very powerful tool set when processing images and generating image content. imagecolorallocatealpha is a function used in the GD library to assign colors to images. It not only allows us to set the red, green and blue components of the color, but also supports the alpha channel, that is, transparency. This function is often used to draw text, shapes, or graphics with transparent effects on images.

During PHP development, get_defined_constants() is a very useful function that returns all defined constants. However, when many developers use it the first time they are confused by its return results: Why does this function return a nested array instead of a simple list of key-value pairs?

The crypt() function is a function used for one-way encryption, which is commonly found in scenarios such as password storage. Although more modern ways such as password_hash() are recommended now, it still makes sense to understand the working mechanism of crypt(), especially the concepts in it. This article will introduce in detail the role, format and practical use examples of Salt in the crypt() function.

When using PHP's MySQLi extension, the mysqli_stmt::attr_get function is used to obtain the attribute value of the preprocessed statement object. However, many developers will encounter the problem that they cannot correctly obtain the property value when calling this function. This article will analyze the possible causes of this phenomenon in depth and provide corresponding solutions.

When building a Socket-based server using PHP, socket_accept() is a key function to implement the server-side connection to the client. However, when running such programs in a Docker container, network configuration may cause socket_accept() to not work properly, such as connection timeout, inability to listen, or client connection failure. This article will provide detailed instructions on how to configure the network in a Docker environment so that PHP's Socket Server can run smoothly.

Performance is often a bottleneck when making large numbers of concurrent HTTP requests in a Laravel project. The curl extension that comes with PHP is a powerful tool for handling HTTP requests, and the curl_share_init function provides the ability to share connections, DNS cache and other resources, which can significantly improve the efficiency of a large number of requests. This article will introduce in detail how to encapsulate a curl_share_init-based HTTP client in Laravel to improve the performance of concurrent requests.

When developing web, password encryption is a key link in protecting user data security. PHP provides a variety of encryption methods, where the crypt() function is a basic but very useful encryption tool. It can encrypt strings in one-way and is often used for password hashing. This article will introduce in detail the use of the crypt() function, the basic syntax, different encryption algorithms, as well as examples and precautions in practical applications.

The crypt() function is often used to encrypt passwords. It can support a variety of hashing algorithms, such as standard DES, MD5, SHA-256, and SHA-512, and its behavior depends on the incoming "salt value". The salt value not only increases the complexity of the password, but also determines the method and result of hashing. Once the salt value is incorrect, even if the user enters the correct original password, it cannot pass the verification.

When using PHP's crypt() function for password encryption, many developers will notice a strange phenomenon: sometimes the length of the encryption result is 13 characters, sometimes 20, 34, or even more. This inconsistency in length can easily make people mistakenly think that there is something wrong with the code, or that the password is truncated or encrypted incorrectly. So, what's going on?

cURL is a very powerful library that allows you to make HTTP requests with other servers. cURL not only handles a single request, but also supports resource sharing among multiple requests. By combining the curl_share_init() and curl_setopt() functions, we can manage sharing some resources between multiple cURL sessions, such as file handles, DNS caches, SSL sessions, etc., which greatly improves the efficiency of concurrent requests.

Constants are a very important concept, and their values ​​during script execution are not changeable. Usually, constants are used to store some fixed configuration values, such as database connection information, system paths, API keys, etc. The get_defined_constants() function can help us get all the constants currently defined.

When using PHP to process images, we often use the imagecolorallocatealpha() function in the GD library to assign colors with alpha (transparency) channels. Its syntax is as follows:

When using PHP for network programming, many developers often encounter a problem when using socket_accept() to create a TCP server: the program is stuck and cannot continue to execute. This phenomenon mostly stems from insufficient understanding of "blocking mode" and "non-blocking mode". This article will explain why socket_accept() "stagnates" and explain in detail the difference between blocking and non-blocking modes.

In PHP programming, we often need to connect to the database and interact with it. When we connect to a MySQL database through the mysqli extension, we sometimes need to check the character set used by the current database connection. The mysqli::get_charset() function can help us get the character set information of the connected. And if you want to view the returned information, the var_dump function is a very good tool.