javascript - Change Jquery variables to PHP -

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i need put javascript variable php variable, dont know how that. possible answers appreciatable.

<script type="text/javascript">          $(document).ready(function(){              $('#number_of_inwards,#number_of_outwards').each(function(){                var product_name,total_stock;                $('#product_name').change(function(){                  product_id = $('#product_name').val();                    });                var hello = "13";               <?php $d = '<script>hello</script>' ?>               total_stock = <?php echo $st[$d]; ?>;               console.log(total_stock);                $(this).focusout(function(){                 var inward = parseint($('#number_of_inwards').val());                 var outward = parseint($('#number_of_outwards').val());                 $('#overall_stock').val(parseint(inward+outward));                 console.log("inside loop"+ inward + outward);               })                        })                                });      </script>

here code.i added dummy variable

hello="13"

and tried php variable won't work, returns empty value.

thanks in advance





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