MySQL - ¿Cómo escribo correctamente esta consulta en PHP?

$dist = $_SESSION['dist'];

$table = "p_".$dist;

$d1=date("m-d-Y",strtotime($d1=$_GET['d1'];

$d2=date("m-d-Y",strtotime($d2=$_GET['d2'];

$sql = mysql_query("SELECT * FROM $table WHERE date(FechaContacto) BETWEEN $d1 AND $d2");

$numero = mysql_num_rows($sql);

$sql = mysql_query("SELECT * FROM $table WHERE date(FechaContacto) >= $d1 AND date(FechaContacto) <= $d2");

$d1=date("m-d-Y",strtotime($d1=$_GET['d1'];

$d2=date("m-d-Y",strtotime($d2=$_GET['d2'];

$d1=date("m-d-Y",strtotime($_GET['d1']));

$d2=date("m-d-Y",strtotime($_GET['d2']));

echo $d1." - ".$d2;