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Getting Deprecated: Call-time pass-by-reference has been deprecated when calling exec() Function
<?php
    $output = array();
    exec("ping google.com", &$output);
    foreach ($output as $key => $value) {
        echo $value . "<br/>";
    }
?>

Call-time pass-by-reference has been deprecated in C:xampphtdocsmy_testajax_loop.php on line 3.

string exec ( string $command [, array &$output [, int &$return_var ]] ) .

...
exec("ping google.com", $output);
...