how to check if username already exists in php

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Anaelle
12 Nov 2020
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
source
Christian
20 Feb 2017
1$sql = "SELECT username FROM table_name WHERE username='{$username}'";
2$result = mysqli_query($con,$sql) or die("Query unsuccessful") ;
3      if (mysqli_num_rows($result) > 0) {
4        echo "Username is already exist";
5      } else {
6             ...............   
7      }
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