get data problem

<?php

/*
$postdata = http_build_query(
    array(
        'sr' => '0',
        'exam' => 'jsc',
        'year' => '2013',
        'roll' => '401505',
        'board' => 'dinajpur',
        'button2' => 'submit'
    )
);

*/


//"sr=3&et=0&exam=jsc&year=2013&roll=401505&board=dinajpur&button2=submit"
// post request will be -
//http://www.educationboardresults.gov.bd/regular/result.php'
//sr=3&et=0&exam=jsc&year=2013&board=dinajpur&roll=401505&button2=Submit&







$url = "http://www.educationboardresults.gov.bd/regular/result.php";
$postdata = http_build_query(
    array(

        'sr'=>'3',
        'et'=>'0',
        'exam'=>'jsc',
        'year'=>'2013',
        'board'=>'dinajpur',
        'roll'=>'401505',
        'button2'=>'Submit'
    )
);
$opts = array('http' =>
    array(
        'method'  => 'POST',
        'header'  => 'Content-type: application/x-www-form-urlencoded',
        'content' => $postdata
    )
);
$context  = stream_context_create($opts);
$result = file_get_contents($url, false, $context);
echo $result;