/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

46 votes205 views6 answers
Add column to migration laravel
PHP Laravel
2 votes160 views5 answers
Laravel drop table migration
PHP Laravel
1 vote134 views1 answer
Php get all txt files in directory
PHP
1 vote141 views1 answer
Php uppercase with accent
PHP
0 vote152 views2 answers
Multiple image upload with CodeIgniter
PHP
3 votes142 views1 answer
Sms laravel
PHP Laravel
0 vote151 views1 answer
Yii::app()->request->get yii1
PHP
2 votes134 views1 answer
Is php still used
PHP
0 vote143 views1 answer
How to log out php
PHP
1 vote144 views1 answer
Regex php password
PHP