In projects separated by front-end, back-end, the front-end (usually a single-page application based on frameworks such as Vue, React, Angular) and the back-end (usually an API service based on PHP, Node.js, Python, etc.) interact through the HTTP interface. To ensure that API responses can be handled correctly by the front-end, avoid cross-domain issues, ensure security and standardization, we must set up the HTTP response header correctly.

In multilingual websites, a good user experience usually requires that you automatically jump to the corresponding language page based on the visitor's browser language or preferred language. PHP provides flexible ways to achieve this, the most commonly used one is to implement redirection through header("Location: ...").

If we want to generate an Excel file for users to download, the commonly used method is to use the header() function to set the correct HTTP header. This article will introduce how to set up Excel export using header(), and explain some notes about MIME types and character encoding.

In PHP, writing data into log files in binary form can effectively reduce storage space and improve read performance. The pack() function combined with fwrite() is an important tool to achieve this. This article will use an example to describe how to use these two functions to write structured data into binary log files and explain relevant technical details.

During PHP development, the header function is often used to set HTTP header information, such as redirection, content type, cache control, etc. Since the header function directly affects the HTTP header information of the response, it is important to ensure that it outputs correctly during debugging. Through the browser's developer tools, you can effectively check whether the header function is output correctly.

In front-end development, the fetch API is a very common interface used to send HTTP requests and get responses. To ensure that the front-end and back-end can exchange data correctly, the configuration of the response header is crucial. PHP provides header function to set HTTP response headers. When used with the front-end fetch API, correct configuration can ensure that problems such as response formats, cross-domain requests can be solved.

In web development, page jumping is a very common operation. In most cases, we will use JavaScript to achieve jumps, or use PHP's header() function to jumps. However, these two jump methods are different in terms of implementation methods, applicable scenarios and impact on user experience. This article will compare these two jump methods to explore the differences between them and suitable application scenarios.

When using PHP to operate a MySQL database, we often need to know how many rows of data a query statement returns. This is particularly common in scenarios such as paging and data verification. This article will introduce how to get the number of rows of the query result through the mysqli_result::num_rows method.

When using PHP for database operations, the mysqli extension provides very convenient functions to connect, query, and operate databases. mysqli_result is the result set object returned when the query is executed. This article will explain how to correctly traverse all the results returned by the mysqli_result function so that query results can be efficiently obtained and processed.

When operating MySQL databases in PHP, the mysqli extension provides rich functions, and the mysqli_stmt class is used to preprocess SQL statements. Among them, the mysqli_stmt::attr_get function is a method specifically used to obtain preprocessing statement properties. Although it is not as commonly used as binding parameters or executing statements, it is very useful in certain scenarios.

When developing applications using PHP and MySQL, we often use mysqli to perform database queries. After executing the SELECT statement, mysqli_query() returns a mysqli_result object, but this object is not a directly available array format. In order to process data more easily, we usually need to completely convert the query results into a two-dimensional array.

Performance optimization is critical when performing large-scale API crawling tasks. For developers using PHP and cURL, rational use of curl_share_init() can significantly reduce system resource consumption and improve efficiency. This article will introduce in detail the function, usage scenarios and how to correctly implement it in the code.

When using the mysqli extension to connect to a database in PHP, the fetch_assoc() method of the mysqli_result object is used to get the next row record from the query result set. This method returns an associative array containing the column name as the key name and the corresponding data as the value. If there are no more records to return, fetch_assoc() returns null. However, many developers will encounter a problem during use: even if the query seems to have no errors, fetch_assoc() still returns null. This article will explore the causes of this problem and provide solutions.

In PHP, when using the mysqli extension for database operations, SQL queries are usually performed using mysqli_query() and the query results are obtained through the mysqli_result object. The mysqli_result object is used to represent the query result set, which allows us to obtain data through methods such as fetch_assoc(), fetch_row(), etc. However, the mysqli_result object is not always valid, it fails in some cases, especially when the query fails.

str_split() is a very useful function that can split strings into character arrays. This function is especially useful when we need to process the content input by the user at a character level. For example, if we want to check whether user input is legal, we can combine str_split() to achieve this function.

When using PHP for MySQL database operations, developers often use related functions in the mysqli extension to execute queries and process result sets. For example, mysqli_query() can be used with mysqli_result object to easily obtain query results. However, if the input parameters are not properly processed when constructing SQL statements, it is easy to cause SQL injection problems, which will lead to abnormal query results, data leakage and even system breakdown.

In PHP, hashing algorithms are an important tool to ensure data integrity and security. PHP provides a variety of hash methods, among which hash_update_stream and openssl_digest() are two commonly used hash functions. However, there are some differences in safety, functionality, performance, etc. between the two. This article will conduct a detailed comparison and analysis of the two to help developers better understand their differences and choose the most appropriate hashing method.

In web development, drawing charts is a common requirement, especially when presenting statistics. Although there are many professional chart libraries, sometimes we only need to use simple text and PHP built-in functions to quickly implement an intuitive bar chart. This article will introduce how to combine character statistics and PHP's imagefontwidth() function to draw a simple text bar chart using the GD library.

When using PHP's Socket extension for network programming, we usually need to deal with various possible errors, such as connection failure, read timeout, write failure, etc. PHP provides socket_clear_error() function to clear error states on Socket resources, which is very important in certain situations, especially when using try-catch exception handling flow. If the error is not cleared, it may cause abnormal behavior of subsequent Socket operations or confusing error messages.