最后找到了和我一样的人(不太可能，但我们永远不知道...):

Finally found for those in the same case than me (unlikely but we never know...) :

<?php
include('../inc/connexion.inc.php');
include('session.php');

$nom = $_POST['nom'];
$num = $_POST['num'];
$img =addslashes(file_get_contents ($_FILES['img']['tmp_name']));



$pseudo = $user_check. "_contact";
$rqt1= "INSERT INTO $pseudo(CTC_NOM, CTC_NUMERO, CTC_IMG) VALUES(:nom, :num, :img)";
$result1 =$cnxpdo->prepare($rqt1);
$result1->execute(array(
    'nom' => "$nom",
    'num' => "$num",
    'img' => "$img"
));

?>

感谢您的帮助.