dir/mod/removeme.php

<?php

function removeme_post(&$a) {

	if(! local_user())
		return;

	if(x($_SESSION,'submanage') && intval($_SESSION['submanage']))
		return;

	if((! x($_POST,'qxz_password')) || (! strlen(trim($_POST['qxz_password']))))
		return;

	if((! x($_POST,'verify')) || (! strlen(trim($_POST['verify']))))
		return;

	if($_POST['verify'] !== $_SESSION['remove_account_verify'])
		return;

	$encrypted = hash('whirlpool',trim($_POST['qxz_password']));

	if((strlen($a->user['password'])) && ($encrypted === $a->user['password'])) {
		require_once('include/Contact.php');
		user_remove($a->user['uid']);
		// NOTREACHED
	}

}

function removeme_content(&$a) {

	if(! local_user())
		goaway(z_root());

	$hash = random_string();

        require_once("mod/settings.php");
        settings_init($a);

	$_SESSION['remove_account_verify'] = $hash;

	$tpl = get_markup_template('removeme.tpl');
	$o .= replace_macros($tpl, array(
		'$basedir' => $a->get_baseurl(),
		'$hash' => $hash,
		'$title' => t('Remove My Account'),
		'$desc' => t('This will completely remove your account. Once this has been done it is not recoverable.'),
		'$passwd' => t('Please enter your password for verification:'),
		'$submit' => t('Remove My Account')
	));

	return $o;

}