Jquery AJAX Save to file

$('a#exportPage').on('click',function(){
var contentMap = {};
$('[id^="appendHeading"]').each(function(){
    contentMap[this.id] = $(this).text();
});
for(id in contentMap)
    $("#PrintIds").append("ObjectID:" + id + "Content:" + contentMap[id]);

$.ajax({
  url: "post.php",
  type: "post",
  data: { 
      objectID: id,
      content: contentMap[id]
      },
      success: function(){
      alert("success");
  },
  error:function(){
      alert("failure");
  }   
 }); 
});

And this PHP:

<?php
if ($_POST['objectID'] || $_POST['content']) {
$myFile = "test.css";
$stringData = $_POST['objectID'] || $_POST['content'];
file_put_contents($myFile,$stringData);
}
?>