/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

3 votes428 views7 answers
Laravel 8 livewire tutorial
PHP Laravel
1 vote282 views1 answer
Php date set utc
PHP
2 votes270 views2 answers
Wordpress activate plugin
PHP
0 vote340 views1 answer
How to check if a url has a certain word in laravel
PHP Laravel
2 votes265 views2 answers
Wordpress is admin
PHP
6 votes297 views2 answers
Get size files in laravel
PHP Laravel
7 votes328 views6 answers
Show featured image in post wordpress
PHP Wordpress
0 vote315 views1 answer
Codeigniter echo set content type
PHP CodeIgniter
0 vote265 views1 answer
Multi line dot match php
PHP
0 vote275 views1 answer
File original extensions laravel
PHP