Snippet outputs a number, how to add it to eForm?

<?php
print "<h2>Your cart</h2>";

for($i = 0; $i < count($_POST["id"]); $i++){
	print $_POST["quantity"][$i]."x " .$_POST["name"][$i].": ".$_POST["price"][$i]."<br/>";
}

print "<h2>Total cost: ".$_POST["cost"]."</h2>";
?>

//<?php
if( !function_exists('customPlaceholder') ){
   function customPlaceholder(&$fields,&$templates){
      $cost = preg_replace('#[^0-9\.]#', '', $_POST["cost"]);
      $templates['report'] = str_replace('[+cost+]',$cost,$templates['report']);
      return true;
   }
}

[[customPlaceholderSnippet]]
[!eForm? &eFormOnBeforeFormParse=`customPlaceholder` ...all your other params...!]

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                                             GlassGiant.com 

<?php print $_POST["cost"]; ?>

<input type='hidden' name="cost" value='[[my-stripped-snip]]' ?>' ... />