Check if the email exists using pdo - php

Question

This is the section I use to add users.
<?php
session_start();
if( isset($_SESSION['user_id']) ){
header("Location: ./index.php");
}
require 'conn.php';
$message = '';
if(!empty($_POST['name']) &&!empty($_POST['email']) && !empty($_POST['password'])):
// Enter the new user in the database
$sql = "INSERT INTO users (name, email, password) VALUES (:name,:email, :password)";
$stmt = $conn->prepare($sql);
$stmt->bindValue(':name', $_POST['name']);
$stmt->bindValue(':email', $_POST['email']);
$stmt->bindValue(':password', password_hash($_POST['password'], PASSWORD_BCRYPT));
if( $stmt->execute() ):
$message = 'Successfully created new user';
else:
$message = 'Sorry there must have been an issue creating your account';
endif;
endif;
?>

Answer 1

I personally do it by using a query and an if statement
$query = $conn->prepare("SELECT * FROM users WHERE email = :email");
$query->bindParam(':email', $_POST['email']);
if ($query->rowcount() = 0)
{
// insert account into database
}
else {
// display error message
}

Answer 2

To check if the email exists or not, you have to write a query whether that email is stored in the database. If the query result is not empty, you can show a message that the email exists. If the query result is empty, you can make him a new user.
For that you have to write this query
$sql="select name from user where email='$email'";
$stmt = $conn->prepare($sql);
if ($stmt->rowcount() = 0)
{
$sql = "INSERT INTO users (name, email, password) VALUES (:name,:email, :password)";
$stmt = $conn->prepare($sql);
$stmt->bindValue(':name', $_POST['name']);
$stmt->bindValue(':email', $_POST['email']);
$stmt->bindValue(':password', password_hash($_POST['password'], PASSWORD_BCRYPT));
}
else {
$msg="Email already exists";
}