Change PMPro Strong Password's minimum required password strength.

change-pmprosp-required-password-strength.php

<?php
/**
 * This recipe sets the required password strength or length for PMPro Strong Passwords *
 * depending on the PHP version and the settings below.
 *
 * You should set your password strength or length in the SETTINGS section below
 * inside the my_pmprosp_password_strength function.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

 // Helper function to set custom password strength or length for PMPro Strong Passwords
function my_pmprosp_password_strength() {

	#--- SETTINGS ---#

	/*
	 * Set minimum password strength ( Requires PHP 7.2 or higher )
	 *
	 * 1 is somewhat guessable (guesses < 10^8), provides some protection from unthrottled online attacks
	 * 2 is safely unguessable (guesses < 10^10), offers moderate protection from offline slow-hash scenario
	 * 3 is very unguessable (guesses >= 10^10) and provides strong protection from offline slow-hash scenario
	 *
	 * Default strength is 2.
	 */
	$min_strength = 3;

	/*
	 * Set minimum required password characters ( if PHP version is lower than 7.2 )
	 *
	 * Default length is 12.
	 */
	$minimum_password_length = 16;

	/*--- That's it, no further editing required. ---*/

	$password_strength = version_compare( phpversion(), '7.2', '<' ) ? (int) $minimum_password_length : (int) $min_strength;

	return $password_strength;
}

function set_pmprosp_minimum_password_score( $min_strength, $password_strength ) {
	// Bail if function is missing or password strength not set correctly.
	if ( ! function_exists( 'my_pmprosp_password_strength' ) || ! in_array( my_pmprosp_password_strength(), array( 1, 2, 3 ), true ) ) {
		return $min_strength;
	}

	$min_strength = my_pmprosp_password_strength();

	return $min_strength;
}
add_filter( 'pmprosp_minimum_password_score', 'set_pmprosp_minimum_password_score', 10, 2 );

function set_pmprosp_minimum_password_length( $minimum_length ) {
	// Bail if function is missing or reset length to default if custom length is zero or smaller.
	if ( ! function_exists( 'my_pmprosp_password_strength' ) || 0 >= my_pmprosp_password_strength() ) {
		return $minimum_length;
	}

	$minimum_length = my_pmprosp_password_strength();

	return $minimum_length;
}
add_filter( 'pmprosp_minimum_password_length', 'set_pmprosp_minimum_password_length' );