PHP gives error that is not present when using replit - php

Question

I was attempting to write a password-protect page in php
<?php
$pass = $_POST['pass'];
if(password_verify($user, '$argon2i$v=19$m=2048,t=4,p=3$Y3NGc25QQ1k1cTBkTHZNRg$skaHiTZAiAYB2bwme/KBhRujlJNXWd7jkji4vP5t5zM')) //hash is Admin
{
header("Location: secure.html");
exit();
}
else
{
if(isset($_POST))
{?>
<form method="POST" action="index.php">
Pass <input type="password" name="pass"></input><br/>
<input type="submit" name="submit" value="Go"></input>
</form>
<?}
}
?>
However, I keep getting the error:
PHP Parse error: Unclosed '{' on line 15 in /home/cody/Desktop/code/Web/secureSignIn/index.php on line 25
This error was not present when working with PHP on Replit. Can anyone explain why this error is showing?
I tried replacing <? with <?php, adding <? php error_reporting(0); ?>, and using echo to run the HTML (Which only printed it to console and did not execute.

Answer 1

This should work:
put the <?php starttag in a seperate line
start again with <?php and not only <?
<?php
$pass = $_POST['pass'];
if(password_verify($user, '$argon2i$v=19$m=2048,t=4,p=3$Y3NGc25QQ1k1cTBkTHZNRg$skaHiTZAiAYB2bwme/KBhRujlJNXWd7jkji4vP5t5zM')) //hash is Admin
{
header("Location: secure.html");
exit();
}
else
{
if(isset($_POST))
{?>
<form method="POST" action="index.php">
Pass <input type="password" name="pass"></input><br/>
<input type="submit" name="submit" value="Go"></input>
</form>
<?php
}
}
?>