Complete required steps:

$-$ Write $3$ PHP functions that takes input and returns true if the input is valid, and false otherwise, these functions should use regular expressions to validate user input.

$-$ Add these functions to an HTML page, create a form with input fields for the member's name, email address, and phone number, and use the validate$\_$email, validate$\_$member$\_$name, and validate$\_$member$\_$phone functions to validate the user's inputs before submitting the form.

function validate$\_$email$($$email$)\{$ # The email address should have a valid format, such as username@example.com

#Define the regular expression pattern and test the email address against the pattern $\}$

function validate$\_$member$\_$name$($$name$)\{$#The name should only contain letters, spaces, and apostrophes $\}$

function validate$\_$member$\_$phone$($$phone$)\{$ #The phone number should only contain digits and optional parentheses, dashes, and spaces $\}$