Change the required password length to 8 for Require Strong Passwords

my-pmpro-strong-passwords.php

<?php // Do NOT copy this line

/**
 * Change pmpro-strong-passwords to require a minimum of 8 characters.
 */
add_filter( 'pmpro_registration_checks', 'my_pmpro_strong_password_check' );
function my_pmpro_strong_password_check( $pmpro_continue_registration ) {

	// Don't load this script at all if user is logged in.
	if ( is_user_logged_in() ) {
		return $pmpro_continue_registration;
	}

	//only bother checking if there are no errors so far
	if ( ! $pmpro_continue_registration ) {
		return $pmpro_continue_registration;
	}

	$username = $_REQUEST['username'];
	$password = $_REQUEST['password'];

	// no password (existing user is checking out)
	if ( empty( $password ) ) {
		return $pmpro_continue_registration;
	}

	// Check for length (5 characters)
	if ( strlen( $password ) < 5 ) {
		pmpro_setMessage( esc_html__( 'Your password must be at least 8 characters long.', 'pmpro-strong-passwords' ), 'pmpro_error' );
		return false;
	}

	// Check for username match
	if ( $password == $username ) {
		pmpro_setMessage( esc_html__( 'Your password must not match your username.', 'pmpro-strong-passwords' ), 'pmpro_error' );
		return false;
	}

	// Check for containing username
	if ( strpos( $password, $username ) !== false ) {
		pmpro_setMessage( esc_html__( 'Your password must not contain your username.', 'pmpro-strong-passwords' ), 'pmpro_error' );
		return false;
	}

	// Check for lowercase
	if ( ! preg_match( '/[a-z]/', $password ) ) {
		pmpro_setMessage( esc_html__( 'Your password must contain at least 1 lowercase letter.', 'pmpro-strong-passwords' ), 'pmpro_error' );
		return false;
	}

	// Check for uppercase
	if ( ! preg_match( '/[A-Z]/', $password ) ) {
		pmpro_setMessage( __( 'Your password must contain at least 1 uppercase letter.', 'pmpro-strong-passwords' ), 'pmpro_error' );
		return false;
	}

	// Check for numbers
	if ( ! preg_match( '/[0-9]/', $password ) ) {
		pmpro_setMessage( esc_html__( 'Your password must contain at least 1 number.', 'pmpro-strong-passwords' ), 'pmpro_error' );
		return false;
	}

	// Check for special characters
	if ( ! preg_match( '/[\W]/', $password ) ) {
		pmpro_setMessage( esc_html__( 'Your password must contain at least 1 special character.', 'pmpro-strong-passwords' ), 'pmpro_error' );
		return false;
	}

	// If we've passed all of the above, return the current continue registration flag.
	return $pmpro_continue_registration;
}

add_action( 'init', 'switch_my_pmpro_password_notice' );
function switch_my_pmpro_password_notice() {

	if ( has_filter( 'pmpro_checkout_after_password', 'pmprosp_pmpro_checkout_after_password' ) ) {
		remove_filter( 'pmpro_checkout_after_password', 'pmprosp_pmpro_checkout_after_password', 1 );
		add_filter( 'pmpro_checkout_after_password', 'my_pmprosp_pmpro_checkout_after_password', 1 );
	}
}

function my_pmprosp_pmpro_checkout_after_password() {
	?>
	<div id="pmprosp-container"></div>
	<?php
	echo '<small id="pmprosp-password-notice">Note: A good password is at least 8 characters long and contains upper and lowercase letters, a number, and a special character</small>';
	wp_localize_script(
		'password-strength-meter',
		'pwsL10n',
		array(
			'empty'                     => _x( 'Strength indicator', 'password strength', 'pmpro-strong-passwords' ),
			'short'                     => _x( 'Very weak', 'password strength', 'pmpro-strong-passwords' ),
			'bad'                       => _x( 'Weak', 'password strength', 'pmpro-strong-passwords' ),
			'good'                      => _x( 'Medium', 'password strength', 'pmpro-strong-passwords' ),
			'strong'                    => _x( 'Strong', 'password strength', 'pmpro-strong-passwords' ),
			'mismatch'                  => _x( 'Mismatch', 'password strength', 'pmpro-strong-passwords' ),
			'password_tooltip'          => _x( 'Note: A good password is at least 8 characters long and contains upper and lowercase letters, a number, and a special character', 'password tooltip displayed on hover over question mark next to password field label', 'pmpro-strong-passwords' ),
			'progressbar_bg_color'      => apply_filters( 'pmprosp_progressbar_bg_color', '#aaaaaa' ),
			'display_progressbar'       => apply_filters( 'pmprosp_display_progressbar', true ),
			'display_password_strength' => apply_filters( 'pmprosp_display_password_strength', true ),
			'display_password_tooltip'  => apply_filters( 'pmprosp_display_password_tooltip', true ),
			'password_blacklist'        => json_encode( apply_filters( 'pmprosp_password_blocklist', array( 'admin', 'administrator', '@dministrator', '@dmin', 'test', 'tester' ) ) ),
		)
	);
}