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Exec with Swetest output is not displayed on Browser but works locally


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Dear all,

I need help urgently. Please review the below code. 

<?php
error_reporting(E_ALL);
error_reporting(-1);
// phpinfo();
if(@exec('echo EXEC') == 'EXEC'){
        echo 'exec works';
        $ram=array();
        echo exec("whoami");
        exec("swetest -b$20.06.1998 -ut02.40.00 -p0123456789DAttt -eswe -house40,37,p -flsj -g -head", $ram);
        //shell_exec("swetest -b$20.06.1998 -ut02.40.00 -p0123456789DAttt -eswe -house40,37,p -flsj -g -head");
        print_r($ram);
        }
?>

This Array Ram is empty Array{} when I run in in URL on browser but when I run the same PHP code on Putty Linux Terminal, it gives below result.  

(
    [0] =>  69.4699711    0.9589330      12.7711722
    [1] =>  137.2047430  12.6210423       3.6491743
    [2] =>  57.5155629    2.0043804      12.4929126
    [3] =>  31.3153898    1.1640522      11.8892585
    [4] =>  64.9341541    0.7061970      12.6475111
    [5] =>  354.5698247   0.1370835      10.9268075
    [6] =>  29.0617305    0.1066860      11.8413060
    [7] =>  312.6691481  -0.0108831       9.4849388
    [8] =>  301.9767792  -0.0136113       9.0252288
    [9] =>  246.6157497  -0.0273073       7.0543078
    [10] =>  223.8406492         -0.0627669       6.1963588
    [11] =>  198.5784533          0.1113581       5.6143622
    [12] =>  155.4844488         -0.0261982       4.3224287
    [13] =>  155.4844488         -0.0261982       4.3224287
    [14] =>  155.4844488         -0.0261982       4.3224287
    [15] =>  78.0000935   4.3224287
    [16] =>  99.9959839   4.3224287
    [17] =>  121.4227768          4.3224287
    [18] =>  146.1570660          4.3224287
    [19] =>  178.0430227          4.3224287
    [20] =>  218.1001694          4.3224287
    [21] =>  258.0000935          4.3224287
    [22] =>  279.9959839          4.3224287
    [23] =>  301.4227768          4.3224287
    [24] =>  326.1570660          4.3224287
    [25] =>  358.0430227          4.3224287
    [26] =>  38.1001694   4.3224287
    [27] =>  78.0000935   4.3224287
    [28] =>  326.1570660          4.3224287
    [29] =>  328.3998653          4.3224287
    [30] =>  220.1804870          4.3224287
)
 

It is Exec permission issue or Swetest 32 bit issue or 64 bit issue. Output comes on terminal while on browser the array is empty. Please advice. 

I am using Cpanel with Alamlinux 9 on a VPS. 

 

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