how make varaible ( $message ) contain multi odds

[lost23]

i have many value in form php

i want send email and auto replay email via ( mail function )

problem is i want send many odds

i mean the form sent email by content by different possibilities

- send link program 1 only

- send link program 2 only

- send link program 3 only

- send link program 1-2 only

- send link program 1 - 3 only

- send link program 2 -3 only

- send link program 1-2-3


this code php

<?php

$first_name = $_POST['first_name_1'];
 $last_name = $_POST['last_name'];
 $middle_name = $_POST['middle_name'];
 $Street_Address = $_POST['adress1'];
$Email_Address  = $_POST['emailadrres'];
 $program1 = $_POST['inputvalue11'];
 $inputvalue = $_POST['inputvalue1'];
$inputvalue2 = $_POST['inputvalue2'];
 $program2 = $_POST['inputvalue22'];
$inputvalue3 = $_POST['inputvalue3'];
 $program3 = $_POST['inputvalue33'];
$inputvalue4 = $_POST['inputvalue4'];
 $program4 = $_POST['inputvalue44'];
 $inputvalue5 = $_POST['inputvalue5'];
 $program5 = $_POST['inputvalue55'];
$inputvalue6 = $_POST['inputvalue6'];
 $program6 = $_POST['inputvalue66'];


 $toaddress = "myemail@domain";
 $subject = "subject";
 $subject2 = "Confirmation";




 $all=
 "
 First Name: ".$first_name."\r\n
 Last name: ".$last_name."\r\n
 middle name: ".$middle_name."\r\n
 Street Address: ".$Street_Address."\r\n
Email Address: ".$Email_Address."\r\n
 Estimated Total1: ".$inputvalue1."\r\n
 program: ".$program1."\r\n
 
 --------------------------------
 Estimated Total2  : ".$inputvalue2."\r\n
 program2  : ".$program2."\r\n
Estimated Total3  : ".$inputvalue3."\r\n
 program3  : ".$program3."\r\n
Estimated Total4  : ".$inputvalue4."\r\n
 program4  : ".$program4."\r\n
 Estimated Total5  : ".$inputvalue5."\r\n
 program5  : ".$program5."\r\n
Estimated Total6  : ".$inputvalue6."\r\n
 program6  : ".$program6."\r\n
 $mailheaders = "From: $Email_Address\r\n";
 $mailheaders .= "To: myemail@domain.com\r\n";
 $mailheaders .= "MIME-Version: 1.0\n";
 $mailheaders .= "Content-type: text/html; charset=iso-8859-1\n";
 mail("$toaddress", "$subject", "$all", "$mailheaders");  //main mail to admin
 mail("$Email_Address", "$subject2", "$message", "$mailheaders");  // auto replay to user contain link program
 echo("thanks.");
 
 die;
 ?>

i want the varaible ( $message ) contain multi odds

thats 7 odds

$message = send link program 1 only

$message = send link program 2 only

$message = send link program 3 only

$message = send link program 1-2 only

$message = send link program 1 - 3 only

$message = send link program 2 -3 only

$message = send link program 1-2-3


i don'y any repeat in this link program in messege