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Editorial Team
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Asked: 2026-05-14T02:01:14+00:00

I have a form that validates the email address and I want to be

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I have a form that validates the email address and I want to be able to place echo '<p class="error">Please enter a valid email address!</p>'; anywhere on the web page without having to put the validation process within the html?

Or should I include the validation process in the HTML form?

Here is the php code.

if (preg_match ('/^[\w.-]+@[\w.-]+\.[A-Za-z]{2,6}$/', $_POST['email'])) {
    $email = mysqli_real_escape_string($mysqli, strip_tags($_POST['email']));
} else {
    echo '<p class="error">Please enter a valid email address!</p>';
}
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1 Answer

  1. Editorial Team

    Slightly different

    if (preg_match ('/^[\w.-]+@[\w.-]+\.[A-Za-z]{2,6}$/', $_POST['email'])) { 
    $email = mysqli_real_escape_string($mysqli, strip_tags($_POST['email'])); 
} else { 
    $error = 'Please enter a valid email address!'; 
}

    Now you can print your $error anywhere on your page

    Okay, make it this:

    if (preg_match ('/^[\w.-]+@[\w.-]+\.[A-Za-z]{2,6}$/', $_POST['email'])) { 
    $email = mysqli_real_escape_string($mysqli, strip_tags($_POST['email'])); 
    echo "valid ";
} else { 
    $error = 'Please enter a valid email address!'; 
    echo "invalid ";
} 
echo $error;
exit;

    What would it say now?

    Another example:

    <?php
$error="";
if (preg_match ('/^[\w.-]+@[\w.-]+\.[A-Za-z]{2,6}$/', $_POST['email'])) { 
  $email = mysqli_real_escape_string($mysqli, strip_tags($_POST['email'])); 
} else { 
  $error = 'Please enter a valid email address!'; 
  $email=htmlspecialchars($email);
} 
?>
<html>
<form>
<?php if ($error): ?>
  <p class="error"><?php echo $error?></p>
<?php endif ?>
Enter email: <input type="text" name="email" value="<?php echo $email?>">
<input type="submit">
</form>
</html>

    Now it works?

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