Validate an E-Mail Address with PHP, complete script

This tutorial will teach you how to validate a e-mail id using regular expression to control email Spam. In this tutorial I used ternary operator to filter the values coming from the input box and avoid errors.

Complete Coding is here

<?php
$email=(isset($_POST['email']))?trim($_POST['email']):'';
function verify($email){
    if(!preg_match('/^[_A-z0-9-]+((\.|\+)[_A-z0-9-]+)*@[A-z0-9-]+(\.[A-z0-9-]+)*(\.[A-z]{2,4})$/',$email)){
        return false;
    } else {
        return $email;
    }
}
if(isset($_POST['submit'])){
        if(verify($email)){
            echo $email." is a valid E-mail ID";
        } else {
            echo $email." is an invalid E-mail ID";
        }       
    }
?>

<form action="" method="post">
<input type="text" name="email" value="<?php echo $email;?>"/><br/>
<input type="submit" name="submit" value="validate" />
</form>

Source: http://html5planet.blogspot.in/2012/07/validate-e-mail-address-with-php.html

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