/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

9 votes407 views3 answers
Laravel join 2 tables eloquent
PHP Laravel
0 vote314 views1 answer
2 chiffres apres virgule php
PHP
0 vote329 views1 answer
How to check ia folder if no have files in php
PHP
4 votes319 views1 answer
Php artisan make:auth Command "make:auth" is not defined.
PHP
0 vote308 views1 answer
Counting time execution duration in time laravel
PHP
1 vote341 views2 answers
Laravel model set new attribute
PHP
2 votes417 views2 answers
Get session id in laravel
PHP Laravel
0 vote408 views1 answer
Laravel whereHas undefined variable
PHP Laravel
0 vote326 views2 answers
Laravel migration table softdeletes
PHP
0 vote364 views1 answer
Laravel validatrion check should be null
PHP Laravel