Styler les erreurs d'un formulaire de contact

Salut tout le monde,

Je viens de mettre en place un formulaire de contact sur mon site.

Il marche bien, je reçois les messages, tout est ok ... sauf que, lorsqu'il y a des erreurs lors du remplissage, la page d'erreur est tout sauf belle (en fait, c'est du texte brut). Comment faire pour intégrer les messages d'erreur dans la page actuelle ?

Voici mon code PHP :

<?php

header ('Content-type: text/html; charset=utf-8');

function stripslashes_r($var)
{
        if(is_array($var))
        {
                return array_map('stripslashes_r', $var);
        }
        else
        {
                return stripslashes($var);
        }
}
 
if(get_magic_quotes_gpc()) //
{
   $_GET = stripslashes_r($_GET);
   $_POST = stripslashes_r($_POST);
   $_COOKIE = stripslashes_r($_COOKIE);
}

if(isset($_POST['email'])) {
     
    $email_to = "ma belle adresse email";
     
    $email_subject = "From the website's contact form. ";
     
     
    function died($error) {
        // error code
        echo "I am sorry, but there were error(s) found in the form you submitted. ";
        echo $error."<br>";
        echo "Please go back and fix these errors.";
        die();
    }
     
    // validation expected data exists
    if(!isset($_POST['name']) ||
        !isset($_POST['email']) ||
        !isset($_POST['comment'])) {
        died('Oops. I am sorry, but there appears to be a problem with the form you submitted.');      
    }
     
    $first_name = $_POST['name']; // required
    $email_from = $_POST['email']; // required
    $comments = $_POST['comment']; // required
    $captcha = $_POST['captcha']; // required
     
    $error_message = "";
    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
  if(!preg_match($email_exp,$email_from)) {
    $error_message .= 'The email address you entered does not appear to be valid.<br>';
  }
	$captcha_exp = 'two';
  if ($captcha_exp != $captcha) {
    $error_message .= 'Hint: <i>two</i> comes after <i>one</i>.<br>';
  }
  
  $string_exp = "/^[A-Za-zé\.¸UûÙùàÀèÈéÉïÏîÎôÔêÊçÇ \,\\\'\-]+$/";
  if(!preg_match($string_exp,$first_name)) {
    $error_message .= 'The name you entered does not appear to be valid. Please check that there are no special caracters or accents.<br>';
  }
  if(strlen($comments) < 2) {
    $error_message .= 'The message you entered does not appear to be valid.<br>';
  }
  if(strlen($error_message) > 0) {
    died($error_message);
  }
    $email_message = "Details below.\n\n";
     
    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }
     
    $email_message .= "Name: ".clean_string($first_name)."\n";
    $email_message .= "Email: ".clean_string($email_from)."\n";
    $email_message .= "Comment: ".clean_string($comments)."\n";
     
     
// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers); 
?>
 
<!-- success html code -->

<?php
}
die();
?>

Merci de votre aide !

J'ai édité mon post précédent.

Merci, je vais voir si je comprends mieux.

Si tu as des questions n'hésite pas.

J'ai modifié mon fichier mail.php comme ceci, si j'ai bien compris, c'est ce qu'il fallait faire :

<?php
// si il y a des erreurs on les stockera ici.
$error = Array();

// si le formulaire est soumis on traite les données
if (!empty($_POST)) {
  
  extract($_POST);

  // on valide les champs
  if (empty($email) {
    $error['email'] = 'Le champs email est obligatoire.';
  } elseif (filter_var($email, FILTER_VALIDATE_EMAIL)) {
  $error['email'] = 'Cette adresse email n\'est pas valide.';
  }
  
  // si il n'y a pas d'erreur on envoi le mail
  if (empty($error)) {
  
    header ('Content-type: text/html; charset=utf-8');

    function stripslashes_r($var)
    {
            if(is_array($var))
            {
                    return array_map('stripslashes_r', $var);
            }
            else
            {
                    return stripslashes($var);
            }
    }
     
    if(get_magic_quotes_gpc()) //
    {
       $_GET = stripslashes_r($_GET);
       $_POST = stripslashes_r($_POST);
       $_COOKIE = stripslashes_r($_COOKIE);
    }

    if(isset($_POST['email'])) {
         
        $email_to = "mon email";
         
        $email_subject = "From the website's contact form. ";
         
         
        function died($error) {
            // error code
            echo "I am sorry, but there were error(s) found in the form you submitted. ";
            echo $error."<br>";
            echo "Please go back and fix these errors.";
            die();
        }
         
        // validation expected data exists
        if(!isset($_POST['name']) ||
            !isset($_POST['email']) ||
            !isset($_POST['comment'])) {
            died('Oops. I am sorry, but there appears to be a problem with the form you submitted.');      
        }
         
        $first_name = $_POST['name']; // required
        $email_from = $_POST['email']; // required
        $comments = $_POST['comment']; // required
        $captcha = $_POST['captcha']; // required
         
        $error_message = "";
        $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
      if(!preg_match($email_exp,$email_from)) {
        $error_message .= 'The email address you entered does not appear to be valid.<br>';
      }
      $captcha_exp = 'two';
      if ($captcha_exp != $captcha) {
        $error_message .= 'Hint: <i>two</i> comes after <i>one</i>.<br>';
      }
      
      $string_exp = "/^[A-Za-zé\.¸UûÙùàÀèÈéÉïÏîÎôÔêÊçÇ \,\\\'\-]+$/";
      if(!preg_match($string_exp,$first_name)) {
        $error_message .= 'The name you entered does not appear to be valid. Please check that there are no special caracters or accents.<br>';
      }
      if(strlen($comments) < 2) {
        $error_message .= 'The message you entered does not appear to be valid.<br>';
      }
      if(strlen($error_message) > 0) {
        died($error_message);
      }
        $email_message = "Details below.\n\n";
         
        function clean_string($string) {
          $bad = array("content-type","bcc:","to:","cc:","href");
          return str_replace($bad,"",$string);
        }
         
        $email_message .= "Name: ".clean_string($first_name)."\n";
        $email_message .= "Email: ".clean_string($email_from)."\n";
        $email_message .= "Comment: ".clean_string($comments)."\n";
         
         
    // create email headers
    $headers = 'From: '.$email_from."\r\n".
    'Reply-To: '.$email_from."\r\n" .
    'X-Mailer: PHP/' . phpversion();
    @mail($email_to, $email_subject, $email_message, $headers); 
  
  }
}
?>
 
<!-- success html code -->

<?php
}
die();
?>

Et j'obtiens :
Parse error: syntax error, unexpected '{' in /homez.361/stephanesj/www/mail.php on line 11

Sauf que débugger du PHP pour moi c'est comme du traduire du chinois, donc j'veux bien encore un coup de pouce s'il te plaît, merci

Fait voir le code de la page de ton formulaire.