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root@dev:/var/www/html/php# cat server.php
<?php

ini_set('display_errors',1); error_reporting(E_ALL);

$host   = "host=localhost";
$dbname = "dbname=server";
$creds  = "user=postgres password=postgres";

// connect to the database
$db = pg_connect("$host $dbname $creds");


// if the register button is clicked
if(isset($_POST['register'])) {
        $username  = $_POST['username'];
        $password1 = $_POST['password'];
        $password2 = $_POST['password_2'];

// ensure that form fields are filled properly
if (empty($username)) {
        array_push($errors, "Username is required.");
}
if (empty($password_1)) {
        array_push($errors, "Passphrase is required.");
}
if ($password_1 != $password_2) {
        array_push($errors, "The two passwords don't match.");
}
}
// if there are no errors, save user to database
if (count($errors) == 0) {
        $password = md5($password_1); // encrypt password before storing
        $sql = <<<EOF
                INSERT INTO username (username, password)
                VALUES ('$username','$password');
                EOF;


$ret = pg_query($db, $sql);
if(!$ret) :
echo pg_last_error($db);
else :
        exit("Table created successfully!".PHP_EOL);
endif;
?>

=================================================================

root@dev:/var/www/html/php# cat index.php

<html>
<body>

<form action="register.php" method="post">
Username: <input type="text" name="username"><br>
Password: <input type="password" name="password"><br>
Confirm Password: <input type="password" name="password_2"><br>
<input type="submit" >
</form>

</body>
</html>

<?php
require('server.php');
?>


======================================================================

root@dev:/var/www/html/php# cat register.php
<?php


echo "<h1> YOU ENTERED THE FOLLOWING </h1><br>";
echo "username: ".$_POST["$username"]."<br>";
echo "username: ".$_POST["$password"]."<br>";
?>
<html>
<h1> Thanks for registering! </h1>
</html>

<?php require("server.php");?>