[PHP] Image de vérification de formulaire

<?PHP if ( isset($_GET['image']) || $_POST['action'] == "submit" ) {
	session_start();
};

// CODE D'AUTHENTIFICATION GIF
if ( isset($_GET['image']) )
{

	$alphanum = "ABCDEFGHIJKLMNPQRSTUVWXYZ123456789";
	$rand = substr(str_shuffle($alphanum), 0, 5);
	$_SESSION['image_random_value'] = md5($rand);
	$image = imagecreatefromjpeg("img/bg".rand(1,2).".jpg&­quot;);
	$bgColor = imagecolorallocate ($image, 255, 255, 255);
	$textColor = imagecolorallocate ($image, 0, 0, 0);
	imagestring ($image, 5, 5, 2, $rand, $textColor);
	header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
	header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
	header("Cache-Control: no-store, no-cache, must-revalidate");
	header("Cache-Control: post-check=0, pre-check=0", false);
	header("Pragma: no-cache");
	header('Content-type: image/jpeg');
	imagejpeg($image);
	imagedestroy($image);
	exit;
}; ?>
<title>Titre page</title>
include("includes/config.inc.php"); ?>

            
			<span class="Style1"><p align="center">&nbsp;</p>
            <p align="center">Titre page</p>
            <p align="center">&nbsp;</p>
            </span>
			
<? if ($_POST['post']=="1") {

	$name = $_POST["name"];
	$firstname = $_POST['firstname'];
	$email1 = $_POST['email1'];
	$email2 = $_POST['email2'];
	$password1 = $_POST['password1'];
	$password2 = $_POST['password2'];
	$newsletter = $_POST['newsletter'];
	$termscheck = $_POST['terms'];
	$referrer = $_POST['referrer'];
	$code = $_POST['code'];

		if ($name == "") {
            $error = $error . 'Vous devez entrer votre nom<br>';
            $checkpass = 'false';
        }
		
		if (ereg('%', $name) || ereg('<', $name) || ereg('>', $name)) {
            $error = $error . 'Votre nom contient un/des caract&egrave;re/s non autoris&eacute;s<br>';
            $checkpass = 'false';
		}
		
		if ($firstname == "") {
            $error = $error . 'Vous devez entrer votre pr&eacute;nom<br>';
            $checkpass = 'false';
        }
		
		if (ereg('%', $firstname) || ereg('<', $firstname) || ereg('>', $firstname)) {
            $error = $error . 'Votre prénom contient un/des caract&egrave;re/s non autoris&eacute;s<br>';
            $checkpass = 'false';
		}

		$res = mysql_query("select count(*) from user where email='$email1'");
        if (mysql_result($res, 0) != 0) {
            $error = $error . 'Votre adresse e-mail est d&eacute;j&agrave; enregistr&eacute;e dans notre base de 		donn&eacute;es<br>';
            $checkpass = 'false';            
        }
		
        if (!ereg('@', $email1) || !ereg('.', $email1) || ereg('yopmail.com', $email1) || ereg('link2mail.net', $email1) || ereg('ephemail.net', $email1) || ereg('jetable.org', $email1)) {
            $error = $error . 'Votre adresse e-mail est invalide<br>';
            $checkpass = 'false';	
        }
		
        if ($email1 != $email2) {
            $error = $error . 'Les deux adresses e-mail saisies ne correspondent pas<br>';
            $checkpass = 'false';
        }
		 
	    if ($password1 == "") {
            $error = $error . 'Vous devez entrer un mot de passe<br>';
            $checkpass = 'false';
        } 
				        
		if (ereg('%', $password1) || ereg(' ', $password1)) {
            $error = $error . 'Votre mot de passe contient un/des caract&egrave;re/s non autoris&eacute;s<br>';
            $checkpass = 'false';
        }
		
		  if ($password1 != $password2) {
            $error = $error . 'Les deux mots de passe saisies ne correspondent pas<br>';
            $checkpass = 'false';
        }
	   
	    if ($termscheck != 1) {
            $error = $error . 'Vous devez accepter le r&egrave;glement pour vous inscrire<br>';
            $checkpass = 'false';
        }
        if(md5($code) != $_SESSION['image_random_value']) {
            $error = $error . "Le code ne correspond pas, réessayez !";
			$checkpass = 'false';
		}
			
		if ($checkpass == 'false') {
            $error = $error . '</font></b></div>';
            echo($error);
        }
		
		if ($checkpass != 'false') {
		echo("REQUETES + INSCRIPTION OK");
		;}
		
			
			 ;} else { ?>

			<form id="form" name="form" method="POST" action="<? $_SERVER['PHP_SELF'] ?>"><table width="600" border="0" align="center">
              <tr>
                <td height="40" colspan="2" class="Style1">Votre nom : </td>
                <td width="47%" height="40" class="Style1"><div align="center">
                  <input name="name" type="text" size="40" />                
                </div></td>
              </tr>
              <tr>
                <td height="40" colspan="2" class="Style1">Votre pr&eacute;nom : </td>
                <td width="47%" height="40" class="Style1"><div align="center">
                  <input name="firstname" type="text" size="40" />
                </div></td>
              </tr>
              <tr>
                <td height="40" colspan="2" class="Style1">Votre adresse e-mail : </td>
                <td width="47%" height="40" class="Style1"><div align="center">
                  <input name="email1" type="text" size="40" />
                </div></td>
              </tr>
              <tr>
                <td height="40" colspan="2" class="Style1">Votre adresse e-mail (confirmation) : </td>
                <td width="47%" height="40" class="Style1"><div align="center">
                  <input name="email2" type="text" size="40" />
                </div></td>
              </tr>
              <tr>
                <td height="40" colspan="2" class="Style1">Votre mot de passe : </td>
                <td width="47%" height="40" class="Style1"><div align="center">
                  <input name="password1" type="password" size="40" />
                </div></td>
              </tr>
              <tr>
                <td height="40" colspan="2" class="Style1">Votre mot de passe (confirmation) : </td>
                <td width="47%" height="40" class="Style1"><div align="center">
                  <input name="password2" type="password" size="40" />
                </div></td>
              </tr>
              <tr>
                <td height="40" colspan="2" class="Style1">Recevoir la lettre d'information : (?) </td>
                <td width="47%" height="40" class="Style1"><div align="center">
                  <input name="newsletter" type="checkbox" value="1" checked="checked" />
                </div></td>
              </tr>
              <tr>
                <td height="40" colspan="2" class="Style1">Acceptation du r&egrave;glement : </td>
                <td width="47%" height="40" class="Style1"><div align="center">
                  <input name="terms" type="checkbox" value="1" />
                </div></td>
              </tr>
              <tr>
                <td width="38%" height="40" class="Style1">Code de v&eacute;rification : (?) </td>
                <td width="15%" class="Style1"><div align="center"><img src="signup.php?image" border="1" width="60" height="20" /></div></td>
                <td height="40" class="Style1"><div align="center">
                  <input name="code" type="text" size="40" maxlength="5" />                
                </div></td>
              </tr>
              <tr>
                <td height="40" colspan="3" class="Style1"><div align="center">
				  <input name="referrer" type="hidden" value="<? echo $ref; ?>" />
				  <input name="post" type="hidden" value="1" />
                  <input type="submit" name="Submit" value="Inscription !" />
                </div></td>
                </tr>
            </table>
			</form>
			<span class="Style1">
			<p align="center">&nbsp;</p>
			</span>
			
			<? ;} ?>