Force WP Password Reset

force-password-reset.php

/**
* This snippet will update ALL Users including Administrators with a randomly generated hashed password
* that is 26 characters long, includes Special characters and Extra Special characters. A Password Reset Email 
* is then sent to the user.
*
* @snippetType: Return info from Child Sites
*/

// Load in WP Core files we need. 
include_once(ABSPATH . WPINC . '/pluggable.php');
include_once(ABSPATH . WPINC . '/user.php');

// Grab All users.
$users = get_users();

// Grab only `administrators` role
// $args = array(
//  'role' => 'administrator'
// );
// $users = get_users( $args );

// Build output.
echo '<ul>';
foreach ( $users as $user ) {
	
	// Generate random secure hashed password and store it. 
	$password = wp_generate_password( 26, true, true );
	wp_set_password( $password, $user->ID );
	
	// Send user Password Reset email.
	retrieve_password($user->user_email);
	
	// Display user list to screen for verification.
	echo '<li>' . esc_html( $user->display_name ) . '[' . esc_html( $user->user_email ) . '] - Password Updated.</li>';

}
echo '</ul>';

Comment out line #14 & Un-comment lines #17-20 to only grab administrator roles.