jquery - Ajax GET but php variable is null -


i try send via ajax simple string, php var null. thank you

function postjson(){ $.ajax({ type: "get", url: "http://www.my-server.de/file.php", data: { 'datastring': "juhu" }, cache: false, success: function()     {         alert("order submitted");     },     error: function()     {         alert("error");     } });

php:

 <?php   echo "value is:";  echo $_get['datastring']; ?>

maybe should try 

$.ajax({    type: "get",    url: "http://www.my-server.de/file.php",    data: { 'datastring': "juhu" },    cache: false,    success: function( response ){        alert( response );    },    error: function() {        alert("error");    } });

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