Warning: mysqli_stmt_execute() expects parameter 1 to be mysqli_stmt, boolean given in C:\wamp\www\Gestion de publication\listing.php on line 11

Warning: mysqli_stmt_bind_result() expects parameter 1 to be mysqli_stmt, boolean given in C:\wamp\www\Gestion de publication\listing.php on line 14

Warning: mysqli_stmt_fetch() expects parameter 1 to be mysqli_stmt, boolean given in C:\wamp\www\Gestion de publication\listing.php on line 17

<?php
//connection à la base de donnée//
include_once'connection.inc.php';

//creation de la requète sql
$sql ='SELECT id_article, titre, auteur, date_pub
FROM article ORDER BY date_pub DESC LIMITE 0,20';

//préparation et exécution de la requete
$rqp = mysqli_prepare($link, $sql);
mysqli_stmt_execute($rqp);

//Association des variables
mysqli_stmt_bind_result($rqp,$id, $titre,$auteur,$date_pub);

// on boucle sur l'ensemble des enregistrements:
while(mysqli_stmt_fetch($rqp)){
	//on formate la date
	$jour = substr($date_pub, 8, 2);
	$mois = substr($date_pub, 5, 2);
	$annee = substr($date_pub, 0, 4);
	$date = $jour.'/'.$mois.'/'.$annee;
	
	// on crée l'affichage
	echo "<a ref='detail.php?id_article=$id'>$titre</a>";
	echo "par $auteur.<font size=2> Publié le $date</font><br>";
}

?>

$rqp = mysqli_prepare($link, $sql); 

$rqp = mysqli_prepare($link, $sql) or die("Erreur de préparation" . $link->error . '<br />);
// En s'aasure d'avantage
if (empty($rqp)){
   echo 'Le prepare statment est NULL';
   exit();
}

Warning: mysqli_prepare() expects parameter 1 to be mysqli, null given in C:\wamp\www\test\index.php on line 10
Erreur de préparation

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "my_database");

/* Vérification de la connexion */
if (mysqli_connect_errno()) {
   printf("Echec de la connexion: %s\n", mysqli_connect_error());
   exit();
}

printf("Information sur le serveur : %s\n", $mysqli->host_info);

/* Fermeture de la connexion */
$mysqli->close();
?> 

Information sur le serveur : localhost via TCP/IP
Warning: mysqli_prepare() expects parameter 1 to be mysqli, null given in C:\wamp\www\test\index.php on line 24
Erreur de préparation