/PHP/How to check user already exists in php

How to check user already exists in php

How to check if username already exists in php

$firstname = $_POST["firstname"];
$lastname = $_POST["lastname"];
$email = $_POST["email"];
$pass = $_POST["password"];

$check_email = mysqli_query($conn, "SELECT Email FROM crud where Email = '$email' ");
if(mysqli_num_rows($check_email) > 0){
    echo('Email Already exists');
}
else{
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $result = mysqli_query($conn, "INSERT INTO crud (Firstname, Lastname, Email, Password) VALUES ('$firstname', '$lastname', '$email', '$pass')");
}
    echo('Record Entered Successfully');
}

Source: stackoverflow.com

How to check user already exists in php

$sql = "SELECT username FROM table_name WHERE username='{$username}'";
$result = mysqli_query($con,$sql) or die("Query unsuccessful") ;
      if (mysqli_num_rows($result) > 0) {
        echo "Username is already exist";
      } else {
             ...............   
      }

Similar codes

0 vote287 views1 answer
Estimation salaireurssaf
PHP
0 vote292 views1 answer
Php sodium extension xampp
PHP
1 vote371 views5 answers
Jobs laravel
PHP Laravel
0 vote363 views1 answer
How to get webhook response in laravel
PHP Laravel
1 vote406 views1 answer
Laravel add (s) at the end of text based on how many data
PHP Laravel
0 vote354 views1 answer
Laravel search and return record with pagination
PHP Laravel
0 vote316 views2 answers
Laravel return 1 as true
PHP Laravel
31 votes327 views5 answers
How to make db seeder in laravel
PHP Laravel
0 vote343 views1 answer
Wp_post wordpress
PHP Wordpress
2 votes354 views2 answers
Get all sort by laravel
PHP