Manipulating file and directory paths using PHP functions Mocktest

chdir() changes the current directory to the specified directory.

The realpath() function returns the absolute path of a file, resolving any symbolic links or relative paths, providing the full path from the root directory.

The pathinfo() function extracts the extension of a file path and returns it as part of the information array.

is_dir() checks if a path corresponds to a directory and returns true if it is a directory and false otherwise.

The dirname() function returns the parent directory of a file path, such as extracting "/path/to" from "/path/to/file.txt".

file_exists() checks if a file or directory exists in the file system and returns true if it exists and false otherwise.

unlink() removes a file from the file system.

is_readable() checks if a file is readable and returns true if it is readable and false otherwise.

The fopen() function is used to open files, but to create a new file, you would typically use the fopen() function with mode "w" or "x" to open the file for writing or create a new file if it doesn't exist.

is_writable() checks if a file is writable and returns true if it is writable and false otherwise.