PHP Decode

<?php session_start(); 
if (isset($_SESSION['user_id'])) { 
    header("Location: account"); 
} 
include "inc/dbconfig.php"; 
include "inc/functions.php"; 
$_1 = ""; 
$_2 = ""; 
if ($_SERVER["REQUEST_METHOD"] == "POST") { 
    $_3 = clean($_POST["fullname"]); 
    $_4 = clean($_POST["phone"]); 
    $_5 = clean($_POST["email"]); 
    $_6 = clean($_POST["password"]); 
    $_7 = explode(" ", $_3); 
    $_8 = $_7[0]; 
    $_9 = isset($_7[1]) ? $_7[1] : ''; 
    if (!filter_var($_5, FILTER_VALIDATE_EMAIL)) { 
        $_1 = "Invalid email format."; 
    } else { 
        $_10 = "SELECT * FROM customers WHERE email = '$_5'"; 
        $_11 = $_12->query($_10); 
        if ($_11 === false) { 
            $_1 = "An error occurred."; 
        } elseif ($_11->num_rows > 0) { 
            $_1 = "User with this email already exists."; 
        } else { 
            $_13 = password_hash($_6, PASSWORD_DEFAULT); 
            $_14 = "INSERT INTO customers (first_name, last_name, email, password, phone)  
                            VALUES ('$_8', '$_9', '$_5', '$_13', '$_4')"; 
            if ($_12->query($_14) === TRUE) { 
                $_2 = "Account created successfully. Please check your email for verification."; 
                $_15 = bin2hex(random_bytes(32)); 
                $_16 = "UPDATE customers SET verification_token = '$_15' WHERE email = '$_5'"; 
                $_12->query($_16); 
                $_17 = "http://$_SERVER[HTTP_HOST]"; 
                $_18 = $_17 . "/verify.php?token=$_15"; 
                $_19 = file_get_contents('emails/email_verification.php'); 
                $_19 = str_replace('{verificationLink}', $_18, $_19); 
                $_20 = $_5; 
                $_21 = 'Basal Salon - New User registration'; 
                $_22 = $_3 . " has registered with Basal Salon."; 
                $_23 = '[email protected]'; 
                $_24 = 'Basal Salon - Email Verification'; 
                $_25 = "From: Basal Salon  <[email protected]>
"; 
                $_25 .= "Content-Type: text/html; charset=UTF-8
"; 
                $_26 = mail($_20, $_24, $_19, $_25); 
                $_27 = mail($_23, $_21, $_22, $_25); 
                if ($_26) { 
                } else { 
                    $_1 = "Error sending email."; 
                } 
            } else { 
                $_1 = "Error creating account."; 
            } 
        } 
    } 
    mysqli_close($_12); 
} ?>