gistfile1.php

<?php
// convert the error reporting value to an array of constant values
// from: http://php.net/manual/en/function.error-reporting.php
$bit = ini_get('error_reporting'); 
$res = array();
while ($bit > 0) { 
    for($i = 0, $n = 0; $i <= $bit; $i = 1 * pow(2, $n), $n++) { 
        $end = $i; 
    } 
    $res[] = $end; 
    $bit = $bit - $end; 
}
var_dump($res);
?>