使用javascript调用随机值

Question

I'm trying to randomize value using javascript but after trying for several hours I am failed continuously many time.

Here is the code which I am using.

<script type="text/javascript">
var banner1 = ["ca-pub-3060228829854466", "8550285936"];
var banner2 = ["ca-pub-3680851546903667", "4280702589"];
var allbanner = [banner1, banner2];
var banner = allbanner[Math.floor(Math.random() * allbanner.length)];
</script>

I have added two array banner[0] and banner[1]. when I am using in another JS, it not calling the value's.

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- 336*280 -->
<ins class="adsbygoogle"
     style="display:inline-block;width:336px;height:280px"
     data-ad-client="banner[0]"
     data-ad-slot="banner[1]"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>

Thanks for your help.

Answer 1

<?php
function generateRandomString($length = 10) {
$characters = '0123456789';
$randomString = '';
for ($i = 0; $i < $length; $i++) {
    $randomString .= $characters[rand(0, strlen($characters) - 2)];
}
return $randomString;
}
?>

 <script type="text/javascript">
 var banner1 = ["ca-pub-3060228829854466", "<?php echo generateRandomString();?>"];
 var banner2 = ["ca-pub-3680851546903667", "<?php echo generateRandomString();?>"];
 var allbanner = [banner1, banner2];
 var banner = allbanner[Math.floor(Math.random() * allbanner.length)];
 </script>