How to print_r $_POST array?

<?php 

 foreach ($_POST as $key => $value) {
  echo '<p>'.$key.'</p>';
  foreach($value as $k => $v)
  {
  echo '<p>'.$k.'</p>';
  echo '<p>'.$v.'</p>';
  echo '<hr />';
  }

} 

 ?>

this will work, your first solution is trying to print array, because your value is an array.

The foreach loops work just fine, but you can also simply

print_r($_POST);

Or for pretty printing in a browser:

echo "<pre>";
print_r($_POST);
echo "</pre>";

$_POST is already an array, so you don't need to wrap array() around it.

Try this instead:

<?php 

 for ($i=0;$i<count($_POST['id']);$i++) {

  echo "<p>".$_POST['id'][$i]."</p>";
  echo "<p>".$_POST['value'][$i]."</p>";
  echo "<hr />";

} 

 ?>

NOTE: This works because your id and value arrays are symmetrical. If they had different numbers of elements then you'd need to take a different approach.