md5_file()
Calculates the md5 hash of a given file
string md5_file(string $filename [,$raw_output=false]);
md5()
Calculates the md5 hash of string
string md5(string $str [,$raw_output=false])
Calculates the md5 hash of a given file
string md5_file(string $filename [,$raw_output=false]);
Calculates the md5 hash of string
string md5(string $str [,$raw_output=false])