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<?php

//servidor
$hostname = "localhost";

//usuario
$username = "root";

//clave
$password = "";

//aqui la base de datos
$dbname = "test";

 $conn = mysql_connect($hostname, $username, $password);

 if (!$conn)

 {

 die('No pudo conectarse: ' . mysql_error());

 }

 mysql_select_db($dbname, $conn);


?>

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>checkbox dinamicos</title>
</head>

<body>

<?php

include 'conexion.php';

$query = "SELECT id, nombre  FROM empresas ";

$subject = mysql_query( $query, $conn );
?>
<h2>  CheckBox Dinamico</h2>

 <form method="post" action=" ">

 <?php

 while($data = mysql_fetch_array($subject)) {
 //aqui imprimo o creo mi checkbox
 echo "<input type='checkbox' value='{$data['id']}'>" . $data['nombre'] . '</br>';
}

?>

 </form>

</body>
</html>