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This function can be used to change file permissions on a *nix system.

Expected parameters:

• $filename: the full path name of a file (including the filename)
• $mode: permission you want to set in octal mode

chmod('var/www/index.php,777);

The call of the method above grants read, write and execute rights.

This function copies a file to a given location. Existing files will be overwritten

Expected parameters:

• $filename: the full path name of a file (including the filename)
• $destination: the full path name of a file (including the filename)

Returns: bool

chmod('var/www/index.php', '/var/www/index2.php');

The call of the method above copies the index.php file to the index2.php file.

This function checks if a file exists at the given location

Expected parameters:

• $filename: the full path name of a file (including the filename)

Returns: bool

exists('var/www/index.php');

The call of the method returns true if the 'var/www/index.php' file exists overwise false.

This function returns the file extension of the given file

Expected parameters:

• $filename: the full path name of a file (including the filename)

Returns: string

getExtension('var/www/index.php');

The call of the method returns the string 'php'.