Converting PHP array to Javascript array [duplicate]

Question

Possible Duplicate:
Best method for converting a PHP array to javascript

I am trying something like this:

<script>
  var product_name = new array();
  <?php
    foreach($products as $key=>$value) {
      echo "product_name[] = $key";
    }
  ?>
</script>

But I could not convert the PHP array to a Javascript array.

Answer 1

<script>
var product_name = new Array();
<?php
    $i = 0;
    foreach($products as $key=>$value)
    {
      echo 'product_name['.$i.'] = '.$key.';';
      $i++;
    }
?>
</script>

Better approach would be using json_encode().