How to add multiple passwords to this PHP code? [closed] - php

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I don't know PHP and have downloaded this code that works perfectly fine.
I add this code on top of any *.php file and it makes that page, password protected that only opens up if you type the password which in this case is 1234.
Now, I want to add 3 passwords instead of 1. I just don't know where to edit this code.
<?php
session_start();
if(isset($_POST['submit_pass']) && $_POST['pass'])
{
$pass=$_POST['pass'];
if($pass=="1234")
{
$_SESSION['password']=$pass;
}
else
{
$error="Incorrect Pssword";
}
}
if(isset($_POST['page_logout']))
{
unset($_SESSION['password']);
}
?>
<?php
if($_SESSION['password']=="1234")
{
?>
<form method="post" action="" id="logout_form">
<input type="submit" name="page_logout" value="Logout">
</form>
<?php
}
else
{
?>
<form method="post" action="">
<div>Protected Content</div>
<br />
<input type="password" name="pass" placeholder="Type your password">
<input type="submit" name="submit_pass" value="Login">
<br /><br />
<div><?php echo $error;?></div>
</form>
<?php
}
?>
Where should I, add what, to be able to have 3 possible passwords?

Answer 1

For this, you may edit password checking line like this:
<?php
session_start();
if(isset($_POST['submit_pass']) && $_POST['pass'])
{
$pass=$_POST['pass'];
$available_passwords = ['12345','pass123','myOtherPassword'];
if(in_array($pass,$ava_passwords))
{
$_SESSION['password']=$pass;
}
else
{
$error="Incorrect Pssword";
}
}
if(isset($_POST['page_logout']))
{
unset($_SESSION['password']);
}
?>