Update the old MD5 hash to the new bcrypt - one approach

gistfile1.txt

/* Update the old MD5 hash to the new bcrypt -- rough outline */
if (strlen($member['password']) === 32) {
    if ($member['password'] == md5( $_POST['password'] )){
		  $password = password_hash( $_POST['password'], PASSWORD_BCRYPT );
		  $DB->query("UPDATE members SET password='{$password}' WHERE id='{$member['id']}';");
		  $auth_success = true;
	  }
} else {
	/* Not 32 characters? Then it is a bcrypt password */
	if (password_verify($_POST['password'], $member['password'])) {
       $auth_success = true;
       $password = $member['password'];
    }
}