WordPress : Afficher des données issues d’une table SQL personnalisée

<?php
add_action( "admin_menu", "chstr_add_menu_page" ); // Ajoute un menu dans la Back-office.

/**
 * Ajoute un menu à l'admin
 */
function chstr_add_menu_page() {
	add_menu_page( "Ma page", "Ma page", "edit_posts", "ma_page", "chstr_ma_page_content", "", 40 );
}

/**
 * Contenu de la page
 */
function chstr_ma_page_content() {
	global $wpdb;
	$table = $wpdb->prefix . 'ma_table';
	$datas = $wpdb->get_results( "SELECT email, id, nom, prenom, societe FROM $table" );

	echo "<h2>Ma page</h2>";
	echo "<table border='1' cellpadding='5' width='70%'>";
	echo "<tr style='font-weight:bold;'>";
	echo "<td>ID</td>";
	echo "<td>Email</td>";
	echo "<td>Nom</td>";
	echo "<td>Prénom</td>";
	echo "<td>Société</td>";
	echo "</tr>";

	foreach ( $datas as $data ) {
		echo "<tr >";
		echo "<td>" . $data->id . "</td>";
		echo "<td>" . strtolower( $data->email ) . "</td>";
		echo "<td>" . $data->nom . "</td>";
		echo "<td>" . $data->prenom . "</td>";
		echo "<td>" . $data->societe . "</td>";
		echo "</tr>";
	}

	echo "</table>";
}