PHP from to email - special characters

[riseguim]

Hi,

I have a form to email script here and whenever someone puts "à, é, etc" anything with an accent in the name or last name section it says that it is invalid.

Also I would like to make the telephone number area required... Might you know how?

<?php 
if(isset($_POST['email'])) {
	
	// EDIT THE 2 LINES BELOW AS REQUIRED     
	$email_to = "[e-mail]";     
	$email_subject = "Un nouveau formulaire est rempli";  
	

	function died($error) {         
	// your error code can go here        
	echo "Il semble y avoir une erreur avec le formulaire que vous tentez d'envoyer.";         
	echo "Voici ces erreurs:<br /><br />";        
	echo $error."<br /><br />";         
	echo "Merci de corriger ces erreurs avant de tenter de renvoyer le formulaire.<br /><br />";         
	die();     
	}     
	
	$first_name = $_POST['first_name']; // required 
	$last_name = $_POST['last_name']; // required  
	$sexe = $_POST['sexe']; // not required
	$telephone = $_POST['telephone']; // not required
	$email = $_POST['email']; // required   
	$experience = $_POST['experience']; // required     
	
	 $checkbox_html = '';
  // lets process them now.
  $checkboxes = $_POST['DomaineInteret'];
  if(empty($checkboxes)) {
    echo("");
    $checkbox_html = '';
  } else {
    $N = count($checkboxes);
     echo("");
     for($i=0; $i < $N; $i++) {
        echo($checkboxes[$i] . " ");
        // instead of echoing you could.. 
        $checkbox_html .= $checkboxes[$i]. "\n";
     }
  }
  
  $checkbox_html2 = '';
  // lets process them now.
  $checkboxes2 = $_POST['qualifications'];
  if(empty($checkboxes2)) {
    echo("");
    $checkbox_html2 = '';
  } else {
    $N = count($checkboxes2);
     echo("");
     for($i=0; $i < $N; $i++) {
        echo($checkboxes2[$i] . " ");
        // instead of echoing you could.. 
        $checkbox_html2 .= $checkboxes2[$i]. "\n";
     }
  }
	
	$error_message = "";     
	$email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';   
	if(!preg_match($email_exp,$email)) {    
	$error_message .= 'Votre adresse courriel est invalide.<br />';      
	}     
 $string_exp = "/^[A-Za-z .'-]+$/"; 
	if(!preg_match($string_exp,$first_name)) {     
	$error_message .= 'Veuillez remplir toutes les sections qui affichent une *<br />';   
	}   
	if(!preg_match($string_exp,$last_name)) {    
	$error_message .= 'Veuillez remplir toutes les sections qui affichent une *.<br />'; 
	}
	if(strlen($experience) < 2) {     
	$error_message .= 'Vous devez remplir la section "expertise".<br />';   
	}   
	if(strlen($error_message) > 0) {     
	died($error_message);   
	}     $email_message = "Formulaire rempli par $last_name, $first_name\n\n";           
	
	function clean_string($string) {       
	$bad = array("content-type","bcc:","to:","cc:","href");       
	return str_replace($bad,"",$string);     
	}          
	
	$email_message .= "Prelast_name: ".clean_string($first_name)."\n";     
	$email_message .= "Nom: ".clean_string($last_name)."\n";
	$email_message .= "Sexe: ".clean_string($sexe)."\n";
	$email_message .= "Telephone: ".clean_string($telephone)."\n";
	$email_message .= "Courriel: ".clean_string($email)."\n";  
	$email_message .= "
	Domaine d'interet:\n". $checkbox_html;
	$email_message .= "
	Qualifications:\n". $checkbox_html2;
	$email_message .= "
	Experience et Expertise: ".clean_string($experience)."\n";    
	
	// create email headers 
	$headers = 'From: '.$email."\r\n". 
	'Reply-To: '.$email."\r\n" . 
	'X-Mailer: PHP/' . phpversion(); 
	@mail($email_to, $email_subject, $email_message, $headers);   
	?>
	<script type="text/javascript">
<!--
window.location = "http://www.dev.cjsmo.org/devenirbenevole2.php"
//-->
</script>
<?php } ?>

[riseguim]

Anyone?