What is the best way to supply many arguments to an if statement?

I have created a form with several user inputs but have the tedious task of checking whether each individual input is not empty before submission. Is there a quicker way, (such as using arrays perhaps) of listing all arguments to the if statement?

At the moment my code looks like this but if possible I would like it to be more efficient in future, like if I were to add more inputs.

<form action="sign-up.php" method="post" autocomplete="off" >
Name:<input type="text" name="name" />
Username:<<input type="text" name="username"  /><br />
Password:<input type="password" name="password1" /><br />
Re-type Password:<input type="password" name="password2"  /><br />
Email:<input type="text" name="email"  />
Address:<input type="text" name="address"  />
Post Code:<input type="text" name="postcode"  />
City:<input type="text" name="city"  />
<input class="submit" type="submit" value="sign up" />
</form>

<?php
if (!empty($_POST['name']) 
&& !empty($_POST['username']) 
&& !empty($_POST['password1']) 
&& !empty($_POST['password2']) 
&& !empty($_POST['email'])   
&& !empty($_POST['address'])
&& !empty($_POST['postcode']) 
&& !empty($_POST['city']) )
{
echo "information has been submitted";
}
else {
echo "please fill in all fields!"
}

?>

If you have any suggestions please comment. Thank you