php - AJAX call success but data not retrieved at server -


i have ajax call passes data php file, createtest2.php, below.

but createtest2.php file throws error 

"notice: undefined index: aaa in c:\xampp\htdocs\testproj\test\createtest2.php on line 2

i have no clue how fix it.

caller.php

$(document).ready(function(){     $("#button_submit").click(function()    {      $.ajax({       type:"post",       url:"createtest2.php",       data:{aaa : "unit_test"},       success:function()       {         alert("success");       }     });  }); });

createtest2.php

$test_name = $_post['aaa']; 

    if using      $test_name = $_post['aaa'];  have call ajax $(document).ready(function(){     $("#button_submit").click(function()    {      $.ajax({       type:"post",       url:"createtest2.php",      data:"aaa=unit_test",       success:function()       {         alert("success");       }     });  }); });

the main thing " data:"aaa=unit_test", "


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