Conditional Rendering in React Complete Guide with Examples 2026

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  Conditional Rendering in React Conditional Rendering is one of the most useful concepts in React. It means showing different content on the screen depending on a condition. For example: If a user is logged in → show Logout If a user is not logged in → show Login If a student has passed → show Congratulations If a product is available → show Buy Now If data is loading → show Loading... React does not have a separate if rendering tag. Instead, we use normal JavaScript conditions such as if, the ternary operator, &&, and switch to decide what should appear in the UI.
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how to create login form in php

        

     how to create login form in php 

Registration form in php






Login Form 

      EXAMPLE :-




<?php
include 'connection.php';
        if(isset($_POST['b1']))
        {
           
            $email = $_POST['uem'];
            $pass = $_POST['upwd'];
    $q="SELECT * FROM userdetails WHERE uem =
'$email' AND upwd ='$pass'";

            $rs = mysqli_query($cn,$q);
            $count = mysqli_num_rows($rs);

                if($count ==1)
                {
                    session_start();//start
            $data = mysqli_fetch_assoc($rs);
                   
      $_SESSION['id'] = $data['uid'];//create
                    echo "<script>
                    alert('login Successfully');
          window.location.href='profile.php';
                    </script>";
                }
                else
                {
                    echo "<script>
                  alert('Invalid Credetials');
                    </script>";
                }

        }

?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content=
"width=device-width, initial-scale=1.0">
    <title>User Login</title>
    <link rel="stylesheet"
href="css/bootstrap.css">
</head>
<body class="">

       
   
  <div class="col-md-4 bg-white shadow-lg
mx-auto mt-5
        p-3">
           
        <h1 class="text-center text-primary">
                Login Here
            </h1>

      <form action="login.php" method="post">
           

            <label>Email Address</label>
<input type="email" name="uem" class="
form-control mb-1"
            required>

            <label>Password</label>
            <input type="password" name="upwd"
class="form-control mb-1"
            required>

         
            <div class="text-center">
          <input type="submit" value="Login"
           name="b1" class="btn btn-primary">

  <a href="index.php" class="btn btn-danger">
Create An account ?</a>


                <br>

                <p class="text-center my-3">
                    <a href="forgot-password.php">
                        forgot password ?
                    </a>
                </p>
            </div>
            </form>
        </div>
</body>
</html>

Login Form 


         Output:-

           PHP FORM (USE TO BOOTSTRAP)/output

Note :- data store in the database php


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