How to store the PHP array value to javascript variable

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Javascript

PHP

when i am storing the php array value to variable and using count function i am getting
correct value like 2 and 3 based on selection.and same value i am passing to javascript like this it showing array and i am using the length function it gives always 5 while
debugging in javascript.I want get the same value which is passing from php variable .how to get the value please help me thanks in advance.

What I have tried:

$count=$_POST['check_list'];
echo "values are ".var_dump($count);
echo "count of array values are".count($count);

cnt='<?php echo $count; ?>';
  alert(cnt);
cnt.length();