/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

2 votes195 views2 answers
Array_chunk in php
PHP
1 vote272 views3 answers
Laravel api enable cors
PHP
0 vote193 views2 answers
Php send values in $_SESSION to other page
PHP
0 vote227 views1 answer
Laravel storage save file folder on disk
PHP Laravel
1 vote211 views2 answers
Add laravel sail build as alias
PHP
0 vote204 views3 answers
Laravel load relationship
PHP
0 vote188 views2 answers
Laravel santum
PHP
2 votes258 views6 answers
Get last id in laravel
PHP Laravel
0 vote233 views1 answer
Wp wc php out of stock product to bottom
PHP Wordpress
0 vote200 views1 answer
Wp_create_user
PHP