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is_dir() Determines if the file is a directory.
is_executable() Determines if the file is executable by PHP.
is_file() Determines if the filename is an actual file or a symbolic link to a file (returns true if a real file).
is_link() Determines if the file is a symbolic link or an actual file (opposite of is_file()).
is_readable() Determines if PHP is able to read from the given file.
is_uploaded_file() Determines if the given file was uploaded to the server via the Web server.
is_writeable() Determines if PHP is able to write to the given file.
file_exists() Determines if the given file exists.
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