Create a vhost config and add an entry to /etc/hosts, then restart apache.

vhost

#! /usr/bin/php
<?php

function bad_usage($extra = null, $status = 1) {
	if (! is_null($extra)) {
		echo "Error: $extra\n\n";
	}
	echo "Usage: sudo vhost \$directory \$domain\n";
	die($status);
}


$me = trim(shell_exec("whoami"));

if ($me != "root") {
	bad_usage("You'll probably want to run that as root.");
}

if ($argc < 3) {
	bad_usage("Too few arguments");
}

$dir = $argv[1];
$domain = $argv[2];

if (! is_dir($dir)) {
	if (is_file($dir)) {
		bad_usage("\$directory must be a directory");
	}
	echo "$dir does not exist. Would you like to create it? [Y|n] ";

	$response = trim(strtolower(fgets(STDIN)));
	if ($response == 'y' || $response == '') {
		mkdir($dir);
	} else {
		die(10);
	}
}

$dir = realpath ($dir);

$vhost_filename = sprintf("/etc/apache2/other/%s-vhost.conf", preg_replace('/[^a-z]/i', '_', basename($dir)));

$vhost_file = fopen($vhost_filename, "w");
fputs($vhost_file, "<VirtualHost _default_:80>\n\tServerName $domain\n\tDocumentRoot $dir\n</VirtualHost>");

shell_exec("echo \"#$dir\n127.0.0.1\t$domain\n\" >> /etc/hosts");
shell_exec("sudo apachectl restart");