validate correct format email php

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Natalie
05 Jun 2016
1$email = $_POST["email"];
2if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
3  $emailErr = "Invalid email format";
4}
source
Sebastián
16 Apr 2019
1// E-mail Code Validation using a four digit number: 
2// var.inc.php: 
3<?php 
4session_start();
5$x = mt_rand(1000,9999);
6// index.php: 
7<?php 
8include_once 'var.inc.php';
9$_SESSION['key'] = $x;
10if(isset($_POST['submit'])){
11    if(!mail($_POST['email-in'], "Verify", "Code: ". $x)){
12        echo "ERROR EMAIL";
13    }else{
14        header("Location: validate.php");
15    }
16}
17?>
18<!DOCTYPE html>
19<html lang="en">
20<head>
21    <meta charset="UTF-8">
22    <meta http-equiv="X-UA-Compatible" content="IE=edge">
23    <meta name="viewport" content="width=device-width, initial-scale=1.0">
24    <title>Validate email</title>
25</head> 
26<body>
27    <form action="" method="post">
28        <input type="email" placeholder="email" name="email-in">
29        <button id="submit" type="submit" name="submit">Submit</button>
30    </form>
31</body>
32</html>
33// validate.php: 
34  <?php session_start();?>
35<!DOCTYPE html>
36<html lang="en">
37<head>
38    <meta charset="UTF-8">
39    <meta http-equiv="X-UA-Compatible" content="IE=edge">
40    <meta name="viewport" content="width=device-width, initial-scale=1.0">
41    <title>Validate</title>
42</head>
43<body>
44    <form action="" method="post">
45        <input type="number" name="user-key">
46        <button type="submit" name="submit-user-key">Validate</button>
47    </form>
48</body>
49</html>
50<?php 
51    if(isset($_POST['submit-user-key'])){
52        if($_POST['user-key'] == $_SESSION['key']){
53            //Do something
54        }
55    }
56?>
source
Matisse
26 Jan 2016
1//BE CAREFUL!!!
2//NEVER VALIDATE A EMAIL WITH A NORMAL PREG MATCH
3//I SAW THIS A LOT VALIDATING A EMAIL IS THE BEST TO SEND A EMAIL 
4//AND VERIFY
5//BECAUSE SOMEONE MIGHT HAVE A RIGHT EMAIL THAT DOESNT WORK BECAUSE OF 
6//PREG MATCH
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