php - Session Doesnt work first time (want explanation ) -


hello seen lot of question session doesn't working first time. couldn't see explanation on question , why doesn't working first time happening during sessioning. mine others first time doesn't working after works fine.

this php sessioning.

session_start();  $personname=$_get['personname']; $surname=$_get['surname']; $testxml=$_get['testxml']; $testdate=$_get['testdate']; $testpkid='0000000000000000000000000000'; include('dbconnect.php');      $proc = "{call p_set_test(?,?,?,?,?,?,?,?,?)}";        $params = array(array($testdate,sqlsrv_param_in),                     array(0,sqlsrv_param_in),                     array($personname,sqlsrv_param_in),                     array($surname,sqlsrv_param_in),                     array($testxml,sqlsrv_param_in),                     array('',sqlsrv_param_in),                     array(101,sqlsrv_param_in),                     array(10,sqlsrv_param_in),                     array($testpkid, sqlsrv_param_out)                      );            $result = sqlsrv_query( $conn, $proc, $params);      if( $result === false )       {            echo "error in executing statement 3.\n";            die( print_r( sqlsrv_errors(), true));            $message2 = "aldaatai";             echo "<script type='text/javascript'>alert('$message2 ' + $testpkid);</script>";     }       $_session['idpktestsession'] = $_post["idpktest"] = $testpkid;     $_session['persontestname'] =$_post['persontrollname'] = $personname;     $_session['persontestlastname'] =$_post['persontrolllastname'] = $surname;

this getting value sessioned values

<?php include('dbconnect.php');  session_start();     $diskuserid = $_session['idpktestsession'];     $diskusername = $_session['persontestname'];     $diskuserlastname = $_session['persontestlastname'];     $diskuserlastname = mb_substr($diskuserlastname, 0, 1);       ?> <?php                     $proc = "{call p_rpt_pattern(?,?)}";                    $params = array($diskuserid,'m');                   $procarr = array();                 $result = sqlsrv_query( $conn, $proc, $params);                              while ($row = sqlsrv_fetch_array($result))                 {?>                     <tr>                         <td><?php echo $row['patterncode']?></td>                         <td><i class="fa fa-chevron-right rightarrow" > </i></td>                         <td><?php echo $row['patterndesc']?></td>                     </tr>             <?php                 }             ?>

this statement written incorrect:

$_session['idpktestsession'] = $_post['idpktest'] = $testpkid;

if want assign value can rewrite above statement this

$_session['idpktestsession'] = $_post['idpktest'];

and if want concatenate 2 values can rewrite this

$_session['idpktestsession'] = $_post['idpktest'] . ','. $testpkid;

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