<?php
$host = 'localhost';
$dbname = '';
$dbuser = '';
$dbpass = '';
$table = 'users';
$colonne = 'username';
$bdd = new PDO('mysql:host='.$host.';dbname='.$dbname , $dbuser , $dbpass, array(PDO::ATTR_ERRMODE => PDO:: ERRMODE_EXCEPTION));
if (isset($_GET['pseudo'])) {
    $pseudo = htmlspecialchars($_GET['pseudo']);
    if (!empty($pseudo)) {
        $contact = $bdd->prepare("SELECT * FROM `".$table."` WHERE ".$colonne." = ?");
        $contact->execute(array($pseudo));
        $verify = $contact->rowCount();
        if (!$verify == 0) {
            $donnees = $contact->fetch();
	        echo $donnees['contact'];
        }else {
            echo 'Utilisateur '.$pseudo.' inconnue';
        }
    }else {
        echo 'Veuillez entrer un pseudo';
    }
}else {
    echo 'Veuillez entrer un pseudo';
}
?>