I don't know what's going on this code , can someone help please

1
<?php extract($_POST); include("database.php"); $sql = mysqli_query($conn, "SELECT * FROM register where Email='$email'"); if (mysqli_num_rows($sql) > 0) { echo "Email Id Already Exists"; exit; } else (isset($_POST['save'])) { $query = INSERT INTO register(First_Name, Last_Name, Email, Password) VALUES ($$first_name, $$last_name, $email, md5($pass)); $sql = mysqli_query($conn, $query) or die("Could Not Perform the Query"); header("Location: login.php?status=success"); } else { echo "Error.Please try again"; }
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My PHP is a little rusty but this is what happens in principle (see comments ↓ )

<?php

extract($_POST);

include("database.php");

// ask the database for a record where the email field equals
// the exctracted $email from the $_POST variable
$sql = mysqli_query($conn, "SELECT * FROM register where Email='$email'");

if (mysqli_num_rows($sql) > 0) {

    // if email already exists, echo that out and terminate the script
    echo "Email Id Already Exists";

    exit;

}

// if $_POST['save'] is set:
 else (isset($_POST['save'])) {

    // tell the database to save the new user with values extracted from $_POST:
    $query = INSERT INTO register(First_Name, Last_Name, Email, Password)

         VALUES ($$first_name, $$last_name, $email, md5($pass));

    // try to connect to database
    $sql = mysqli_query($conn, $query) or die("Could Not Perform the Query");

    // if connection/save was successful, redirect to login page
    // with "status=success" in GET parameter
    header("Location: login.php?status=success");

} else {
   
    echo "Error.Please try again";

}

If that doesn’t answer your question, you’ll have to be more specific about what confuses you.

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