increase the minimum password strength required during membership checkout or signup

pmpro-require-strong-password-minimum-strength.php

<?php
/**
 * Require a Stronger Password Score for Member Registration
 * 
 * This recipe works with the PMPro Require Strong Passwords Add On to increase 
 * the minimum password strength required during membership checkout or signup.
 * 
 * 
 * It also customizes the message shown to members when their password is rejected.
 * 
 * Score Reference:
 * 0 = very weak
 * 1 = weak
 * 2 = medium
 * 3 = strong
 *
 * Add this code to a custom plugin or a snippet manager plugin such as Code Snippets.
 * See: https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

/**
 * Set the minimum acceptable password score to 3 (strong).
 */
function my_pmprosp_minimum_password_score( $min_strength, $password_strength ) {
	$min_strength = 3; // Require strong or very strong passwords.
	return $min_strength;
}
add_filter( 'pmprosp_minimum_password_score', 'my_pmprosp_minimum_password_score', 10, 2 );