validasi email php code example

Example 1: email validation php

// E-mail Code Validation using a four digit number: 
// var.inc.php: 
<?php 
session_start();
$x = mt_rand(1000,9999);
// index.php: 
<?php 
include_once 'var.inc.php';
$_SESSION['key'] = $x;
if(isset($_POST['submit'])){
    if(!mail($_POST['email-in'], "Verify", "Code: ". $x)){
        echo "ERROR EMAIL";
    }else{
        header("Location: validate.php");
    }
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Validate email</title>
</head> 
<body>
    <form action="" method="post">
        <input type="email" placeholder="email" name="email-in">
        <button id="submit" type="submit" name="submit">Submit</button>
    </form>
</body>
</html>
// validate.php: 
  <?php session_start();?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Validate</title>
</head>
<body>
    <form action="" method="post">
        <input type="number" name="user-key">
        <button type="submit" name="submit-user-key">Validate</button>
    </form>
</body>
</html>
<?php 
    if(isset($_POST['submit-user-key'])){
        if($_POST['user-key'] == $_SESSION['key']){
            //Do something
        }
    }
?>

Example 2: php validate email

//BE CAREFUL!!!
//NEVER VALIDATE A EMAIL WITH A NORMAL PREG MATCH
//I SAW THIS A LOT VALIDATING A EMAIL IS THE BEST TO SEND A EMAIL 
//AND VERIFY
//BECAUSE SOMEONE MIGHT HAVE A RIGHT EMAIL THAT DOESNT WORK BECAUSE OF 
//PREG MATCH

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