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Editorial Team
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Asked: 2026-06-15T09:29:16+00:00

I’m new to custom functions in PHP. I’m using the following function, from a

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I’m new to custom functions in PHP. I’m using the following function, from a book, to validate email addresses:

<?php

$email = $_POST['email'];

function is_email($email) {
// Checks for proper email format
    if (!preg_match('/^[A-Za-z0-9!#$%&\'*+-/=?ˆ_`{|}~]+@[A-Za-z0-9]+(\.[A-Za-z0-9]+)+[A-Za-z]%/', $email)) 
    {
        return false;
    } 
    else 
    {
       return true;
    }
}

?>

<!DOCTYPE html>
<html>
<head>
<title>Validate Email</title>
</head>
<body>

    <form method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>">
    Email<input type="text" name="email"></input>
    <input type="submit" value="Send">
    </form>

</body>
</html>

Now, I want to show a message if the email was correct, and show a message if it wasn’t correct. I don’t really know know what to do next. I’ve already tried the following, before the ?> closing tag:

if (is_email($email) == true) {
    echo "Right";
}
elseif (is_email($email) == false) {
    echo "Wrong";
}

But this doesn’t do anything. What’s the solution for this?

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1 Answer

  1. Editorial Team

    We’ll I’m not 100% sure what exactly is causing your issues here, but allow me to provide another way to validate emails within a custom function. You really don’t have to re-invent the wheel because there is already a native PHP method to validate emails.

    function validateEmail($email){
  return filter_var($email, FILTER_VALIDATE_EMAIL);
}

$email = $_POST['email'];
if (validateEmail($email)){
  echo 'Valid email!';
}else{
  echo 'Email NOT valid!';
}

    I’m using the filter_var() method here with a FILTER_VALIDATE_EMAIL.

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