$_POST and CSV File

Consider the following:
<?php
setcookie ("start", time());
$array = array("block1.html","block2.html","block3.html");
shuffle($array);

include ("formopen.html");// contains Html Header and Form Tags
include("$array[0]");
include("$array[1]");
include("$array[2]");
include ("formclose.html"); // contains html end tags + submit button


?>

The form is split in 3 parts. The order is random. How do I save the info from a $_POST into a csv file that has a specific header? (NOTE: Each element of the form is named after a column into the csv file)

I know that the following does not do it.

//Open csv file and grab first row
$fp = fopen ("data/data.csv",'a+'); // open file
$data = fgetcsv($fp, 1000, ","); // get csv

// write data in a csv file


foreach ($_POST as $data => $v) //data is over written ..:(
 {

   fwrite ($fp, "$v,");
  ;
 }
.

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