This function will escape the unescaped_string
,
so that it is safe to place it in a mysql_query().
This function is deprecated.
This function is identical to mysql_real_escape_string()
except that mysql_real_escape_string() takes a
connection handler and escapes the string according to the current
character set. mysql_escape_string() does not take a
connection argument and does not respect the current charset setting.