用ajax获取一个json数组

Question

I want to get an array that I used with Ajax. I already used this method with an other page and this time it doesn't work, so I don't see where is the problem.

I have an array :

var array_downloads = <?php echo json_encode($array_downloads);?>;

This array isn't empty, when I do a console.log I get the content, the list of the elements.

After that, I make my Ajax request like that :

$.post("pack.php", {arr:array_downloads}, function(data) { 
...
},'json');

So I send my array to the file .php.

Finally I want to get the array with this :

$array_downloads = $_POST["arr"];

And when I try to echo it (and I don't forget the json_encode()), I get null. I don't understand why. Help please !

Answer 1

I tries with the same code and it works as it is suppose to:

The only code I changed is wrapped json_encode output in quotes so that javascript will consider it as a string.

main.php

<?php $array_downloads = [1, 2, 3, 4, 5]; ?>
<script>
    var array_downloads = '<?php echo json_encode($array_downloads);?>';
    $.post("pack.php", {arr: array_downloads}, function (data) {
        console.log(data);
    }, 'json');
</script>

pack.php

<?php
var_dump(json_decode($_REQUEST['arr'],true));
?>

Output in pack.php

array (size=5)
  0 => int 1
  1 => int 2
  2 => int 3
  3 => int 4
  4 => int 5