This article explores how to use PHP's mysqli::$errno to precisely capture and return MySQL database error codes in RESTful API development, enhancing backend stability and error response accuracy.

In modern web development, ensuring the security of websites is an essential responsibility of developers. Browsers provide many mechanisms that enhance website security by setting specific HTTP headers, such as X-Frame-Options, X-Content-Type-Options, and Strict-Transport-Security. These headers help prevent attacks like clickjacking, MIME type sniffing, and cross-site scripting (XSS).

When using the MySQLi extension to execute database queries, it is often necessary to know how many fields (columns) are included in the returned result set. This is particularly useful when dynamically processing query results (e.g., constructing tables or exporting data).

When working with PHP to interact with MySQL databases, many developers use mysqli_query to execute queries, which returns a mysqli_result object. Sometimes, we just want to extract a specific column of data, such as all usernames or IDs, into an array. Doing this manually with a while loop can be cumbersome. However, PHP's built-in array_column() function can make this process much simpler.

In modern web development, handling multilingual characters is an essential task. Especially when developing with PHP, improper handling of character encoding often leads to garbled text. iconv and str_split are two very useful PHP functions that can help us correctly handle multilingual characters and avoid encoding issues. This article will introduce how to use these two functions to handle characters in different languages.

The hash_update_stream() function is used to update hash values when processing large amounts of data, which is particularly useful for handling large files or streaming data. To improve code reusability and scalability, we typically encapsulate this functionality within a class. This article demonstrates how to build a reusable hash class that encapsulates the PHP function hash_update_stream() for streaming data hash calculation.

get_defined_constants() is a built-in PHP function that returns an associative array containing all the constants defined in the current script. The keys of the array are the constant names, and the values are their corresponding values. You can use this function to view all constants defined at runtime and perform further processing or analysis.

When using the mysqli extension in PHP for prepared statements, some developers may encounter a confusing error message:

When using the connect() function in PHP to connect to a database, encountering the "Access Denied" error is a common issue. This error generally indicates that the connection to the database is not allowed due to permission issues, resulting in a failed connection. This article will explain the steps and methods for troubleshooting this type of issue, helping you quickly locate and resolve the problem.

In PHP development, the factory pattern is a common design pattern that encapsulates the object creation process, making the system structure more flexible and easier to extend. However, when a factory method returns different types of objects based on the passed parameters, we need a way to ensure the returned object's type matches the expected one to avoid runtime errors or logical issues. The is_a() function can help us achieve this goal.