/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 vote297 views1 answer
Url images in CSS file link not working on PHP page|
PHP
0 vote330 views1 answer
Import class route laravel
PHP
0 vote316 views1 answer
Php url variable xss sanitize
PHP
2 votes369 views2 answers
Laravel migration column type json
PHP Laravel
0 vote317 views1 answer
Redirect to attempting url after login laravel
PHP
2 votes290 views1 answer
Sql repare php
PHP
7 votes323 views3 answers
Laravel - Query Builder Left join
PHP
1 vote289 views2 answers
Laravel check if object empty
PHP
1 vote377 views2 answers
Displaying variables in blade laravel
PHP Laravel
0 vote304 views2 answers
Column of csv to array php
PHP