html - How can I define a jquery var to a php variable? -

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i have simple question i've been looking , workin on awhile , can't seem it. heres code.

<script>   function calculate() {     var total = (parseint($('#studenttut option:selected').val()) + parseint($('#campusrb>option:selected').val())) * parseint($('#yearsatten>option:selected').val());     $("#total").html("<table width='100%'><tr><td>your calculated cost is: $" + total +"</td>" +     "<td align='right'>" +     "<?php $calculatedcost = " + total + ";" +     " ?>");      } </script>

any suggestion on how can define jquery var php variable?

you cannot set jquery variable php .. since php server side code , javascript client side.... can use ajax send var server side.. or use form post var server... can use val() place value form..

 $('#inputid').val(total);

and post form


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