Files are organized into directories, also called folders. This article describes how to create and remove directories and how to get a list of the files in a directory.
To create a directory, use the mkdir function, as follows:
This statement creates a new directory named testdir in the same directory where the script is located. If a directory already exists with the same name, a warning is displayed and the new directory is not created,
You can check first to see whether the directory already exists by using the following statements:
echo “Directory already exists!”;
Getting a list of the files in a directory is often useful. For example, you might want to provide a list of files for users to download or want to display images from files in a specific directory.
PHP provides functions for opening and reading directories. To open a directory, use the opendir statement, as follows:
$dh = opendir(“/topdir/testdir”);
If you attempt to open a directory that doesn’t exist, a warning is displayed.
The variable $dh is a directory handle, a pointer to the open directory that you can use later to read from the directory. To read a filename from the directory, use the readdir function, as follows:
$filename = readdir($dh);
After this statement, $filename contains the name of a file. Only the filename is stored in $filename, not the entire path to the file. To read all the filenames in a directory, you can use a while loop, as follows:
while($filename = readdir($dh))
The readdir function doesn’t provide any control over the order in which filenames are read, so you don’t always get the filenames in the order you expect.