Description: array array_rm_dupes(array array, [boolean is_sorted]) array_rm_dupes() removes duplicate values from an array. It takes input array and returns a new array without
duplicate values. array_rm_dupes() sorts the input array in case if is_sorted flag is "false" (default). Two elements are considered equal if and only if (string) $elem1 ===
(string) $elem2 NOTE THAT UNLIKE THE STANDARD array_unique() FUNCTION KEYS ARE PRESERVED!
isValidEmail is an express email address validation routine, which checks if the given email address is _looks_ like a valid one. Also it searches DNS for MX records
corresponding to the hostname extracted from the address (optional).