javascript - Create a session when i select any option in select box using PHP? -

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I am trying to create a session while selecting an option in a selection box but it is not working I can not even get the value from the selection box. I am using isset ($ _ POST ['SelectBoxName']) , is there a choice?

I am trying to code below, but it is not working.

I already have one more session in the same program, will it be a problem? This is used for any other process, and I want to make another session for any other process, but both should be in the same program. Another session is working perfectly, but it is not. 

  & lt ;? Php echo " Select the name = 'Cart' attribute style = 'width: 50px;' Onchange = 'ajaxQuantityChange ()' "; {Foreach ($ value as $ key2 = & gt; $ value2) for {$ Q = 1; $ q  "; // Make a session if (project $ ($ _ POST ['cartquantity'])) {$ _SESSION ['cartrint'] = $ _ POST ['cartrint']; }? & Gt;

This is the "ajaxquantitychange" function: 

  & lt; Script type = "text / javascript" & gt; Function Ajax QuantityChange () {var quantity; If (window.XMLHttpRequest) {volume = new XMLHttpRequest (); } And {quantity = new ActiveXObject ("Microsoft.XMLHTTP"); } Quantity.onreadystatechange = function () {if (quantity.readyState == 4 & amp; amp; amp; Quantity.status == 200} {document.getElementById ("Last Price"). InnerHTML = quantity.responseText; }} Quantity.open ("GET", "finalprice.php", is true); Quantity.send (); } & Lt; / Script & gt;

My complete code is in this link, please check it and someone can solve my question?

There is a problem with your line, 

  echo "& lt ; TD & gt; & lt; Select name = 'cart' validity style = 'width: 50px;' Onchange = 'ajaxQuantityChange ()' ";

You did not close the tag tag it should be 

  echo " & lt; Select name = 'cartwheat' style = 'width: 50px;' Onchange = 'ajaxQuantityChange ()' & gt; ";

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