How to delete and rename files using PHP

PHP, as a server-side scripting language, is widely used in developing web applications. Deleting and renaming files are also very common operations. In this article, we will detail how to delete and rename files using PHP.

1. File deletion

File deletion refers to completely deleting files from the file system. Once deleted, it cannot be recovered. In PHP, the function to delete files is unlink(). The basic syntax format of this function is as follows:

bool unlink ( string $filename [, resource $context ] )

where $filename means The name of the file to be deleted, $context is an optional parameter, indicating the context information of the file. This function returns true if executed successfully, otherwise it returns false.

Next, let’s look at some specific examples. Suppose we have a file named test.txt with the path /data/test.txt. We can delete it using the following code:

if (file_exists('/ data/test.txt')) {

if (unlink('/data/test.txt')) {
    echo "文件删除成功！";
} else {
    echo "文件删除失败！";
}

} else {

echo "文件不存在！";

}
?>

In the above code, we first use file_exists() function to detect if the file exists and then delete it using the unlink() function. If the deletion is successful, the message "File deletion successful!" will be output to the user; otherwise, the message "File deletion failed!" will be output.

2. File Renaming

File renaming means modifying the file name and/or path of a file, but the file content will not change accordingly. In PHP, the function name for renaming files is rename(), and its basic syntax format is:

bool rename ( string $oldname , string $newname [, resource $context ] )

Among them, $oldname represents the file name to be renamed (including the full path), $newname represents the new file name (also includes the full path), and $context is an optional parameter, indicating the context information of the file. This function returns true if executed successfully, otherwise it returns false.

Next, look at the following example. Suppose we now have a file named test.txt with the path /data/test.txt. Now we need to rename it to data.txt and move it to /data directory, we can use the following code:

if (file_exists('/data/test.txt') && !file_exists('/data/data.txt')) {

if (rename('/data/test.txt', '/data/data.txt')) {
    echo "文件重命名成功！";
} else {
    echo "文件重命名失败！";
}

} else {

echo "文件不存在或目标文件已经存在！";

}
?>

In the above code, we first use the file_exists() function to detect whether the /test.txt file exists , and use the !file_exists() function to detect whether /data/data.txt already exists. If both conditions are met, use the rename() function to rename the file to data.txt and move it to the /data directory. If the rename is successful, the message "File rename successful!" will be output to the user, otherwise the message "File rename failed!" will be output.

To sum up, this article introduces in detail how to perform file deletion and file renaming operations in PHP, and gives corresponding code examples. For PHP developers, mastering these skills is very important to help improve development efficiency and program quality.

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