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Userid or email login in PHP


database.php

<?php
$servername='localhost';
$username='root';
$password='';
$dbname = "crud";
$conn=mysqli_connect($servername,$username,$password,"$dbname");
if(!$conn){
die('Could not Connect My Sql:' .mysql_error()); } ?>

index.php

<?php
session_start();
$message="";
if(count($_POST)>0) {
include_once 'database.php';
$result = mysqli_query($conn,"SELECT * FROM user_data WHERE (userid='" . $_POST["userid_or_email"] . "' or email='" . $_POST["userid_or_email"] . "') and password = '". $_POST["password"]."'");
$row = mysqli_fetch_array($result);
if(is_array($row)) {
$_SESSION["userid"] = $row[userid];


} else {
$message = "Invalid Userid or email or Password!";
}
} if(isset($_SESSION["userid"])) { echo "Success"; }
?> <html> <head> <title>User Login</title> </head> <body> <form method="post" action="" align="center"> <div class="message"><?php if($message!="") { echo $message; } ?></div> <h3 align="center">Enter Login Details</h3> Userid or mobile:<br> <input type="text" name="userid_or_email"> <br> Password:<br> <input type="password" name="password"> <br><br> <input type="submit" name="submit" value="Submit"> <input type="reset"> </form> </body> </html>