Language Notes

In PHP, you can use the built-in string function strpos() to check whether a specified string exists within another string. Below is an example of using the strpos() function to determine whether a specified string is present: 🔒 Hidden content: View after commenting. $myString = "This is a sample string"; $findString = "s...";

Very practical operation! PHP code: 🔒 Hidden content: Viewable after logging in<?php // Connect to MySQL database $host = "localhost"; // MySQL server address $username = "your_username"; // MySQL username $password = "your_pa…

Manual modification of one or two tables in the database is fine! But I have more than 260 tables with data, and it’s exhausting to do it manually! At this time, you need to use PHP to make batch modifications! To replace the table prefix of a MySQL database, you need to perform the following steps: Connect to the MySQL database. Query all table names in the database. Iterate through each table, replacing its name with the new prefix. Execute an ALTER TABLE statement for each table to modify the table name...

You can use the `header()` function in PHP to redirect the user to the `/e/admin` directory under the current domain name. You can retrieve the current domain name using `$_SERVER['HTTP_HOST']`, concatenate it with `/e/admin`, and then use the `header()` function to perform the redirection. Here is an example code snippet: `<?php // Get the current domain name...`

I have published a similar article before "PHP obtains the remote .sql.zip file, then clears the data, and then imports the .sql.zip into the mysql database", but here is another function that is also available for personal testing! 🔒 Hidden content: members can view /** * Download the ZIP compressed file containing the SQL file from the remote URL, decompress the SQL file to the specified directory, and then import the data to M…

You can use PHP's mysqli extension to operate the MySQL database. The following is a sample code to obtain the remote .sql.zip file, then clear the database, and then import the .sql.zip into the mysql database: &lt;?php // Set the MySQL database connection information $host = 'localhost'; $dbname = 'my_database…

The TRUNCATE command can be used to clear a table; however, if you need to clear an entire database, you must clear each table individually. Below is an example SQL statement for clearing an entire database: SET foreign_key_checks = 0; SELECT CONCAT('TRUNCATE TABLE `',table_name,'`;') FR...

In PHP, you can use the `rmdir` function to delete a directory. This function removes the specified directory; however, if the directory is not empty, it cannot be deleted directly – the files and subdirectories within it must first be removed. Below is an example of using the `rmdir` function to delete a specified directory: $dir = '/path/to/dir'; // 要删除的目录路径 if (is_dir($dir)) {// If...

The `tempnam()` function is one of the built-in functions in PHP, used to create a temporary file in a specified directory and return the path name of that file. Its function prototype is as follows: `string tempnam(string $dir , string $prefix)`. Here, the `$dir` parameter specifies the path to the target directory; if not provided, the system's default temporary directory path is used.

`sys_get_temp_dir()` is a built-in PHP function used to retrieve the path to the system's temporary directory. On most operating systems, there is a default system temporary directory, which is typically used for storing temporary files, temporary caches, and other temporary data. The `sys_get_temp_dir()` function returns the path to the temporary directory of the current operating system; this allows a program to use this directory for storing temporary files...