When using PHP for database operations, we usually interact with the MySQL database through the mysqli extension. mysqli provides rich functions, one of the commonly used attributes is errno, which represents the error code for database operations. If mysqli::$errno returns 0, it usually means no error has occurred. However, does returning 0 mean that there is no problem with the database operation? This article will discuss this issue in detail.

The mysqli extension is a common tool for handling MySQL database connections and queries. Unlike the mysql extension, mysqli provides more functionality and flexibility and supports object-oriented programming. When using mysqli for database operations, we may need to capture error messages to debug the program or display useful prompts to the user. PHP provides two properties: mysqli::$errno and mysqli::$error to help developers get error information, but they have some subtle differences and are suitable for different scenarios. This article will analyze their differences in depth and discuss which attribute is more suitable

When using PHP to manipulate MySQL databases, we often use the mysqli extension to connect to the database. However, during the actual development process, database connection errors occur frequently. In order to facilitate us to detect whether the connection is successful, we can obtain the error code through mysqli::$errno to determine whether there is any problem with the database connection. This article will introduce how to determine whether a MySQLi connection is wrong through mysqli::$errno, and how to process it according to the error code.

Database interaction is inevitable when developing web applications. As a popular server-side language, PHP provides multiple ways to operate databases, and MySQLi (MySQL Improved) is one of them. It supports not only an object-oriented approach, but also a process-based approach. MySQLi provides a variety of ways to handle database queries and errors, one of which is mysqli::$errno.

When developing PHP websites, the user login function is almost an integral part of it. However, if user input is accidentally processed, it is vulnerable to SQL injection attacks. mysqli::stmt_init is a method provided by the mysqli extension, which can be used to effectively prevent SQL injection with preprocessing statements. This article will use a specific example to describe how to use it to implement a secure login authentication mechanism.

MySQLi provides a variety of ways to operate MySQL databases, where prepared statements can effectively prevent SQL injection. mysqli::stmt_init and bind_param are two functions commonly used when implementing preprocessing statements. This article will introduce how to use these two functions correctly for parameter binding.

mysqli::stmt_init is a method for creating prepared statements, helping developers prevent SQL injection and enhance the security of database operations. However, many developers overlook common error checks when using mysqli::stmt_init, which can lead to potential vulnerabilities or issues during runtime. This article explores some of the common areas where error checks are often ignored when using the mysqli::stmt_init function.

Prepared Statements are an important means to ensure data security and improve efficiency when using MySQLi extensions in PHP. This article will introduce in detail the correct usage of the mysqli::stmt_init function and prepare() method, and analyze it in combination with actual examples.

In this article, we will explore how to use the mysqli::stmt_init function to prepare and execute an SQL prepared statement, a key feature in enhancing security by preventing SQL injection.

The mysqli extension provides powerful MySQL database operation functions, where the mysqli::stmt_init function is a key function for initializing a preprocessing statement. This article will explain in detail how to initialize and prepare MySQL statements using the mysqli::stmt_init function.

In daily PHP development, mysqli::debug is usually used to simply view database connection process and execution details. It may be sufficient in the early stage of debugging, but when the project gradually becomes more complicated, relying solely on mysqli::debug often fails to meet the in-depth analysis needs of performance bottlenecks or complex queries. Therefore, this article will take you through how to smoothly transition from mysqli::debug to a more powerful debugging tool - Xdebug and MySQL slow query logs, thereby systematically improving database debugging efficiency.

When learning and teaching database operations, it is important to understand the behavior of MySQL and the execution of SQL queries. For PHP developers, the mysqli::debug method provides a very intuitive way to help us see the interaction between MySQL and PHP, especially when doing database operations.

During PHP development, we often need to debug operations of MySQL database. mysqli::debug is a very useful tool that can output debugging information. Although mysqli::debug outputs debug information to the browser or console by default, sometimes we need to save this information to a remote log server for easier troubleshooting and analysis in the future.

Debugging is an indispensable link in the process of developing PHP applications and interacting with MySQL databases. Debugging tools and logs are particularly important especially when locating connection problems, querying performance problems, or unexpected errors. Two commonly mentioned debugging methods are the use of the mysqli::debug() function and local debug logs that enable MySQL (such as general_log and slow_query_log). Although they can help developers understand the operation of the database, they vary in their purpose, mechanism and degree of detail.

Mysqli::debug() is a very useful tool when debugging database connection issues or analyzing slow queries. But will it affect application performance? This is a question that developers often care about. This article will conduct a quantitative analysis of the performance impact of mysqli::debug() through actual PHP test code.

Debugging database operations can become complicated when doing PHP development, especially when handling multiple database connections in one application. PHP's mysqli::debug method is a less-mentioned but very useful debugging tool, especially suitable for analyzing database connections, executing statements, and even viewing underlying network activities.

When performing database-related unit tests, we sometimes need to have a deeper understanding of what exactly is happening, especially when the test fails and involves complex SQL operations. PHP's mysqli extension provides a very practical debugging function mysqli::debug(), which can output the underlying operation logs to a file. This article will introduce how to combine mysqli::debug() to implement the debugging function of database operations when using PHPUnit for testing.

In web development, especially in projects using PHP + MySQL, the database behavior differences between the development environment and the online environment often cause a series of strange problems. For example, some queries are fast locally, but the online is as slow as a snail; or there is no error reported locally, but the online execution fails. In this case, if there are no clear clues to track it, a lot of time may be wasted.

When developing PHP projects, debugging database operations is one of the keys to improving development efficiency. Especially when using MySQLi extension for database operations, enabling mysqli::debug can help us view the executed SQL queries, the execution time of the query, and potential error information in real time. This article will explain in detail how to correctly enable mysqli::debug in the local development environment to ensure that the debugging process is more efficient.

Database debugging and performance monitoring are very important links in the development process. Through effective debugging methods and monitoring tools, we can quickly discover problems and optimize them. The mysqli::debug method can help us debug operations of MySQL database, and the general log of MySQL provides detailed query logs. In this article, we will explore how to combine these two for dual analysis to optimize database debugging and performance monitoring.