php check if user exists in database

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Finn
14 Jun 2017
1$q = mysql_query("SELECT username FROM User WHERE username=$username", $cnn); if (mysql_num_rows($q) != 0) { echo "Username exists"; } else { echo "Write your code here"; }
source
Davide
09 Oct 2018
1$firstname = $_POST["firstname"];
2$lastname = $_POST["lastname"];
3$email = $_POST["email"];
4$pass = $_POST["password"];
5
6$check_email = mysqli_query($conn, "SELECT Email FROM crud where Email = '$email' ");
7if(mysqli_num_rows($check_email) > 0){
8    echo('Email Already exists');
9}
10else{
11    if ($_SERVER["REQUEST_METHOD"] == "POST") {
12    $result = mysqli_query($conn, "INSERT INTO crud (Firstname, Lastname, Email, Password) VALUES ('$firstname', '$lastname', '$email', '$pass')");
13}
14    echo('Record Entered Successfully');
15}
16
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